Chevrolet - Suburban :: 2007 - Misfire After Working On Engine / SES Light Flashing While Driving
I replaced the oil pressure switch on an '07 Suburban 5.3L because the oil pressure was showing low once the engine warmed up. That did nothing, then I found out about that little filter/screen under the sensor. I intended to remove and clean the filter then reinstall it. While I was pulling it out, I dropped it back behind the engine and couldn't find it. I checked online and found a few people in other forums that said to just remove the screen as a "fix", so I left it out and put the sensor back in, just to get the vehicle drivable. It started right up and ran fine for me, parked it, and a after sitting for a few hours it started popping while driving with the SES light flashing on the drive home.
Code P0300 was set, no cylinder specific misfire codes were present. I checked the misfire data and cylinder #6 showed tens of thousands of misfires, #5 showed several hundred, but I think it was just picking them up from #6 since #5 is right after #6 in the firing order. I disabled each injector with a scan tool, all changed the idle except #6, it did absolutely nothing. #6 fuel injector had good pulse to it, I connected a fuel pressure gauge and put power/ground to injectors #6 and #4, both dropped the same fuel pressure. I did the "cylinder deactivation" test on the scan tool for the four cylinders that have it, they all did the exact same thing - the engine bogged way down for a couple seconds and then died. Is that normal? I can't say I've ever seen a V8 engine die before when running on 6 or 7 cylinders. I checked compression on cylinder #6, it showed very low, almost zero, but I tried it a few times and it would show just a little compression at times... valves staying shut? I'm thinking when I opened the pressure relief valve on the gauge and the piston was near the bottom of the cylinder may be when it showed some compression. I also switched the coil/wire/plug from #6 to other cylinders and the miss did not follow.
Could having that screen out cause this problem? Having the engine die when deactivating the cylinders makes me wonder if maybe it's commanding all four at the same time, although the test shows each cylinder being controlled separately. Using a MODIS, not a TechII. I just got done putting in a new filter/screen to see if it would make any difference, and of course it didn't.
Suburban :: 2000 4WD - Code P0300 Misfire Only Occur At Idle
I have a 2000 Suburban 4wd that has a p0300 code. The misfires are coming mainly from #2 and #7 cylinders. Misfires only occur at idle. over 1500 rpm the misfires disappear. I have put new A/C Iridium plugs in, new wires, and new coil packs on both cylinders but the problem is not any better. All 8 fuel injectors all go to 55 psi when activated and drop to 28 when released. All tests were done with my Snap-On Solus.
View 2 RepliesSuburban :: AC And Heat - Rear Air Working Sometimes?
When I purchased my suburban the a/c and heat would sometimes work in the front and rear. They "fixed" the problem and now a year later the entire rear component works sometimes and not others.
View 1 RepliesSuburban :: 1994 - Heater Is Not Working And No Control On Front Vents
I have a 1994 suburban1500 heater is not working in front or rear and in the front I have no control on the vents it only blows on the floor flashes if I try and change from floor to vents or defrost also blows air on floor while driving with the fan off so seems that the vent is stuck open the rear I have control on vent or floor just will not blow heat just outside temp air I had the same problem with a buick I had and never figured out the problem this is driving me crazy.
View 1 RepliesSuburban :: Front Blower Motor Stopped Working On All Speeds
I own a 99 Suburban 1500 5.7. The front blower motor stopped working on all speeds so I replaced the resistor, it still did not work. I then replaced the speed selector switch and it started working fine. Three days later I smelled a slight electrical burning smell and the fan stopped working again. I plan on replacing the switch again to see if that is what went bad. Whats causing this to happen? Maybe the motor is going bad and causing the switch to short?
View 6 RepliesSuburban :: 97 K2500 Suburban Shaking When Braking Above 30mph
I have a K2500 suburban that has a rather aggressive/violent "vertical" shake when braking above 30mph... I bought it about 6 months ago and was told it just had a full brake job all around(receipts provided). The shake has been off and on, mostly reserved to highway speeds, however recently it has been constant at any speed above 30mph... Thinking it may be the rotors. I pulled the wheels off and even though everything looked brand new (as described) I replaced the rotors and put on new pads... did not fix the shake... and I had the old rotors mic'd and they came back good as new with zero need to turn/resurface.
I was told it may be the ABS, So I pulled the fuse... and it didn't fix the issue also I have no light on the dash
I was told it may be a flat spot on the rear drums, so I replaced the rear drums and it didn't fix the problem... the shoes looked brand new and had just as much pad left as the set i was replacing them with, so I left them alone.
I had happened to have new tires put on it, and they advised my pitman arm and idler arm were shot and that they couldn't do an alignment, so I replaced the pitman and idler and brought it back to be aligned which they did... this did not resolve any issues...
I spoke with the previous owner and he said he had the same issues and couldnt figure it.. he said his mechanic replaced the wheel bearings, rotors, pads, calipers, brake lines, ball joints(all receipts provided, and all these parts look brand new)...
The shake is very aggressive it makes the dash jump up and down and vibrates the hood to the point where it looks like it will rattle off.. the pedal doesn't pulse and the steering wheel aside from vibrating up and down doesn't pull or shake one way or the other... truck doesn't pull when braking or during this shake... and the second you let off the brake the shaking stops... and only ever shakes when you hit the brakes...it rides as smooth as can be when not braking...
Suburban :: 5.7L Engine / Acts Like Crank And Drags
what could make my 1999 chevy suburban with a 5.7L engine act like it want crank. It turns over like the battery is dead. I replaced the battery and the starter but it still drags then it will catch and start. After it starts it runs perfect. Then when I cut it off. The same problem occurs. Could this be a timing issue?
View 4 RepliesSuburban :: 2008 Oil Leak From Engine Compartment
I have a 2008 gently driven suburban ltz that I bought, used at a dealer auction that seems to have developed a slow oil leak from the engine compartment. Why this has happened now?
It now has 70,000 miles.
Chevrolet - Suburban :: Flutter In Engine When Accelerate
2007 Chevy Suburban, 65K milesLet me start by saying I took this into to the dealer and they found nothing!
When I accelerate, I get a "flutter" in the engine. The best description of this flutter is that the RPMs go down about 200 or 300. I think it feels like it is sluggish when it accelerates. It is most obvious during the 35 - 60 MPH range, but you also see it when cruising at 70 MPH.
I tried adding some fuel treatment and ran some 93 octane through it to see if it was the fuel injectors, with no change in the behavior. No error messages or engine light is on. Regular oil changes and services (60K service, every 3K miles for oil change). Driving behavior has changed since I bought a Prius 3 months ago. It used to be driven 40 miles / day (+ long trips) and now is driven about 40 miles / week (+ long trips).
Chevrolet - Suburban :: 2002 - Engine Stalls At 75 Mph
2002, Chevy, Suburban 1500, 4wd, 5.3L engine, 210,000 miles. Mass airflow sensor and both O2 sensors replaced last year in an effort to fix this problem. Original problem surfaced when the vehicle was shut down or running uphill and had about 1/2 tank of gas in hot weather. If stopped, the vehicle would not start until it had cooled down. Sometimes getting it onto level ground would be enough to get it running again. ( This accomplished by turning on the key and allowing the vehicle to roll back out of the parking place. ) If running down the road, getting to level ground after the stall, pulling to the shoulder and cooling the engine/waiting a few minutes and restarting the vehicle would work. This was before the above mentioned repairs.
Last weekend in 60 degree weather I was driving back from northern Michigan and as I headed up hill at 75 mph with the tank at 1/2 the vehicle did a high speed stall on me. Symptoms were: RPM showed 2000, but pushing down on the gas actually dropped the RPM no matter how feather-footed I was. This was tried several times. I turned on the 4 ways and moved toward the shoulder and at 50 mph finally got the thing to restart. The rest of the trip home was uneventful.
I had a 2001 Suburban with the same specs which did this same thing until a factory recall that got me a new fuel pump. I asked about the recall the last time my truck was in for service and they said it does not fall within the serial numbers for that recall. Fuel filter replaced about 9 months ago. Co-incidentally but not necessarily related is that my battery with less than 3 years of a 7 year warranty was draining itself in less than 2 days this last winter.
Suburban :: Engine Stutters And Sometime Stalls Only In 3rd And 4th Gear
I have a problem I have been struggling with for the last year.... Here are the main symptoms:
- Engine stutters and sometime stalls ONLY in 3rd and 4th gear
- 1st and 2nd gear has NEVER given us a problem
- The outside temperature has to be above 75 degrees. The truck ran great all winter, but last week with the first warm day, acted up again
- There has to be a sizable load (6 adults, full tank of gas)
- gets much worse going up hills (again load)
Not sure if it is related but one time in the winter, the truck stopped blowing heat. If I turned off the fan, the system would "build up" heat but then as soon as I turned it back on, the heat would stay for maybe 30 seconds and then fizzle out back to cold air. This happened only on the coldest day of the year. The heat has been decent the rest of the time.
Last year they replaced the crankshaft position sensor like 4 times, then claimed it was the ECM, replaced that and it still acted up. Then they finally said it was some corrosion in the wiring harness. However by the time they got through with it, it got cold enough outside where it didn't act up any more.
Suburban :: 2001 Denali - Engine Oil And Antifreeze Leakage
I got a 2001 Denali with the 6.0l. It seems to be leaking engine oil to the rear of the oil pan on both sides. It has residue where the oil cooler lines are at, by the drain plug, under the bell housing and around the starter. Also, I noticed there was some antifreeze on the right side axle towards the right front of the motor. I can't see any signs of the water pump or thermostat leaking. Where either of these could be leaking from?
View 1 RepliesChevrolet - Suburban :: Engine Revs When Vehicle Stopped
My engine revs up no matter if the thing is hot or cold when I come to a stop at a red light, SOMETIMES. Other times it will idle at 100 and then wants to idle around 1000 and has idled as high as 1200. I've been told EGR, TPS, Idle Control Motor, or Intake gaskets. I did have a code 22 which occurred after a friend unplugged the TPS and reconnected it, but no other codes or check engine lights. Tuned engine 2 weeks ago, but problem still persists. Where do I start and what equipment do I need. I am a professional diesel tech, but not so much with gas.
View 3 RepliesSuburban :: 1995 K1500 4x4 - Check Engine Code 35
I have a 1995 suburban k1500 4x4 i just pulled a check engine code 35 what could be causing it to appear? I need to know if its something small or a big fix?
View 2 RepliesChevrolet - Suburban :: 1996 - Dry Start Only When Engine Warm
My Burb starts right up when the engine compartment is cold. Can barely touch the key and the thing fires right up.
Once engine compartment is hot (operating temp), I shut off the motor, let it sit for a few minutes and I get about 3-5 seconds of dry start each time I start it. It fires right up, runs great after that dry start period.
The dry-start behaves as if it's starved for fuel for those 3-5 seconds.
It's a K1500 with a stock 5.7l (350 ci). 180,000 miles and the entire drivetrain runs like a top. Only mod I've made is a K&N cold air intake.
Here's what I've done/changed recently (i.e. within the past 5k miles):
Fuel pump, OEM installed by dealer.Fuel filter.Ignition control module, BWD.Ignition coil, BWD.Crankshaft position sensor, GM OEM.Engine coolant temp sensor, BWD.Oxygen sensors (all four), GM OEM.Catalytic converter, replaced one of the two.Plug wires, BWD.Plugs, Delco OEM.Distributor cap and rotor, BWD.Cleaned ground connection (bolts to frame) for fuel pump.Alternator, new not reman.PCV valve.Battery.
Full diagnostics by a very qualified shop two weeks ago, no bleedback from injector spider, fuel pressure solid and holds perfectly. After 90 minutes of troubleshooting, the mechanics finally gave up.
One last thing with potential that I can think of is that I started running ethanol-free gas around the same time this issue surfaced. Not at the exact time, but at a relatively similar time. Gas mileage has increased by 40% and power increased, hard to blame "bad gas."
Suburban :: 99 Engine Died And Wouldn't Start When Driving At 50mph
I am working on a99 2500 4x4. 7.4 Replaced 230,000 engine with 90,000 engine.I had to fix a bad oil leak from the oil pressure sensor. Replaced it and delivered it.
Ran great Gal was driving at 50mph. Engine died and wouldn't start. She fried starter trying. Replaced starter, has no codes. 59-60 lbs fuel pressure with key on then holds 50 lbs. 60 lbs while cranking. Has spark at plug. NO security light staying lit or flashing. flashes then goes out. Smell of unburnt fuel is strong. Also no oil pressure at gauge when cranking and her key fob doesn't work.
Suburban :: 95 - Engine Shut Off Suddenly When Waiting On Signal Light
I was sitting at the light waiting for it to turn green and all of a sudden the engine shut of with all of the check engine lights come on, it stop fast and hard like someone just turned the ignition off. What can cause this? I turned the key to the off position and it started right up agin and has been no problem all week, but I am worried about driving it right now.
View 9 RepliesSuburban :: 99 - Engine Turns Over But Doesn't Start After Fuel Pump Replacement
Just replaced the fuel pump in my 99 Suburban. Replacement is an AC Delco unit. When I tried to start it, nothing. Engine turns over but doesn't start. Checked all connections and getting voltage down to new harness. replaced relay from GM dealership and also fuel filter. I used to hear the old pump prime when turning on the ignition but don't hear anything with the new pump. Could it be a bad pump out of the box?
View 1 RepliesChevrolet - Suburban :: 1997 - Diesel Engine Dies - Dashboard Lights Don't Come On
My '97 Chevy Suburban diesel dies at random times. Nothing seems to trigger it; it usually happens when I'm just driving along, minding my own business; not accelerating or decelerating, turning, stopping, etc. Has happened with the fuel tank at every level: full, half full and quarter tank. When it dies, the dashboard lights do NOT come on. When I turn the key "off" and back "on", the lights come on and the engine will crank fine, but won't start. Ten minutes later, it starts and everything is fine. It may not do it again for weeks, or it may do it again in 10 minutes.
This last time, the fuel tank was fairly low -- below a quarter tank -- and it seems to "buck" or "hesitate a little just before it died the first time. The dealer replaced the crankshaft position sensor and the fuel injector pump. When it started doing it again, they ran every diagnostic test they had and could find nothing wrong. Ran fine for a few weeks, then quit three times in 30 minutes. It's back there now.