Trans Sport :: 1992 Pontiac - Huge Vacuum Leak And MPG Loss
One of the '92 Pontiac Trans Sports (3.1L V6 engine) had developed a huge thirst - the fuel consumption had doubled along with a serious loss of power. All ignition components - distributor cap, rotor, spark plug wires and oxygen sensor are new ACDelco's.
ECM is not throwing-up any fault codes but we suspect a vacuum leak since this engine runs better with the air intake covered-up almost completely.
Is there any way to trace and fix this kind of issue? Any vacuum diagram for this car - I couldn't seem to find it in the GM Service Manual... How would you suggest we proceed?
Chevrolet - 1500 :: Slight Rough Idle / Loss Of Power - Vacuum Leak
I have a misfire in the 6 cylinder on my 98 Chevy c1500 5.7l 350 v8 2wd. I changed the spark plugs and wires, cap and rotor, and changed the spider injector i put the spider injector in from another engine I had. After doing all this the code still comes up. The truck runs fine and except it idles slight rough not bad at all and now it says I have a vacuum leak and while I'm driving you can feel the loss of power. I tried all the ways to do it like on YouTube. What is wrong with my truck?
View 10 RepliesFord 6.0L Power Stroke Diesel :: Coolant Leak And Pressure Loss
I recently had an upper radiator hose bust and ever since I have been having a slight water leak. It appeared to be coming from between the layers of rubber on the new hose which I replaced twice since the incident. Both hoses had water seeping from the same location. This afternoon I plan on doing a pressure test on the cooling system to diagnose where the water may be coming from.
My question is could a loss of pressure cause larger than normal Oil and Water deltas? If I have to replace the radiator is there a particular manufacturer or type I should avoid? Should I try to get a factory replacement from Ford or would an Autoparts unit be sufficient? The original is still in the truck now with 286,000 miles on it.
GTI 337/20th Anniversary :: Coolant Loss - Won't Find Possible Leak?
I've had the car about 3 months now. It runs fine, never overheats, but I keep having to add coolant (every 2 weeks or so), but I can't see a leak anywhere.
I searched and found one guy that said it could be a bad expansion tank cap, and another that said it could be a tiny leak that only leaks when driving.
Anyway, when replacing my axle, I noticed this:
If that's dried coolant, where would that be from?
Ford Super Duty (1999-2016) :: 2006 V10 - Loss Of Vacuum While Towing
Having trouble with vacuum on my '06 CCLB V10. I only lose vacuum while towing, not sure why. Lines all seem like they're fine. I have no issues while unloaded. What could be causing this?
View 8 RepliesChevy - Malibu :: 2003 V6 3.1 - Coolant Loss / Loud Knock / Loss Of Power And Misfire?
I have a 2003 Chevy Malibu, V6, 3.1, auto, 140k miles. Car started out with code 0420 with no noticeable symptoms, but then added code 0303 (miss fire cyl #3) with loud knock (mostly after warmup) and loss of power under load. Now internal loss of coolant (no puddles or external drips). Changed plugs and wires - no change - all plugs looked good with no sign of contamination. Questions - if this is a valve/piston/lifter problem (which would explain the knock, miss-fire and loss of power), why would I get the loss in coolant? If the loss of coolant is fouling plug #3 (which would explain the coolant loss, miss fire and loss of power), could that give me the loud knocking? I don't see how a valve/piston/lifter issue would cause a leak in coolant but I also don't see how a coolant leak into cyl #3 would give me such a loud knock. Do I have two different problems? If it is a leak into cyl #3, is there any way to tell if it is the intake manifold gasket (which leaked before and was replaced five-six years ago and which I could do again if I had to) or a blown head gasket (which I don't think I could fix or afford to get fixed)? Engine will occasionally get hot (but not overheat).
View 7 RepliesFord - F350 :: Way To Find Vacuum Leak?
My ford's 4x4 will work if I manually lock in the hubs. If i use the auto option it will not engage. I can feel the rear end diff lock when I put it in 4-low so I know the switch is working. I think it is a vacuum actuated system. How to find the leak or diagnose the problem?
View 7 RepliesFord A/C :: Stuck On Defrost - Vacuum Leak?
I know all about vacuum leaks and such causing this problem, and I tend to think that is my problem. But isn't the temp change dial also vacuum controlled (in my case of an 06 f250 6.0) by that valve near the oil fill tube on the passenger side? I ask because, while I am stuck on defrost i can change the temp of the air that comes out still, telling me there is enough vacuum in the system to at least control that.
I also know everyone talks about checking the ESOF system for cracked lines/leaks, but this shouldn't come in to play unless I have 4WD selected or if the EFOF solenoid is bad, right? I just got done tearing the top end of this engine apart, twice, for oil temp problems and am about done working on this POS!!!
Ford Super Duty (1999-2016) :: 2000 F250 V10 - Vacuum Loss Prevent 4x4 Lo Range Engagement
2000 6.8 v10 F250 supper duty crew cab. 4x4 high switch's on (manual lock hubs installed) but 4x4 low will not engage. Brake input/out put tested good. Trans switch Park/"N" both test good. PCM reads switch output in all modes, (dash 4x4 selector). The only other issue I am having is the Vacuum is bad ( defrost default no blend door operation). Would vacuum loss prevent 4x4 lo range engagement (with manual hubs ) or should I go to the solenoid, relays on the case/ right fender?
View 4 RepliesFord Excursion :: Stuck On Defrost Vacuum Leak
Ok, I have capped off the vacuum lines to the front hubs and replaced the vacuum solenoid on the passenger inner fender. Still stuck on defrost. I know there are several options from this point what would be the next step after what I have just recently done. Going away on a ski trip and would like to have it working properly before I go.
View 14 RepliesFord Fuel System :: PCV Causing Vacuum Leak
So I was was tired of trying to tune my Holley 650 and finally threw in the towel and got a 600 Edelbrock. When the holley was on there the engine had the slightest surge but I was never able to pin down a vacuum leak. The PCV valve made quite the racket while running.
Now the edelbrock is on there and no matter what I did I could not get the idle below 750 (4 speed truck). I checked the carb, manifold, hoses, and boosters and no vacuum leaks. I disconnected the PCV port at the carb and plugged it and it immediately stalled.
I went down to the local speed shop and got a new PCV grommet that has a small opening (restricting) and some foam filter material in it. Got home and popped it in and the idle dropped right down to a near stall. Adjusted the screw and she's running fine.
Now for the question. Did I fix the problem or just band aid it? Has anyone heard of having to restrict the PCV circuit?
Ford - E250 :: 2005 - Vacuum Leak / Truck Will Not Start
My truck has a vacuum leak or something. it will not start no mater what i do until i take off the vacuum house that goes from the back of the throttle to the right side of the valve cover. and when it running if i put it back it stop.i have changed that vacuum hose and the connector on the valve cover. What is going on here?
View 10 RepliesFord - Explorer :: 2006 4.0 SOHC - Small Vacuum Leak
I'm having a little bit of trouble finding the cause of a minor problem on my 06 Explorer with the 4.0 V6 engine. When the engine is running cold at idle, it runs a bit rough and idle speed is high as well. When fully warm, the engine runs and idles fine. I hooked up a scan tool and there are no pending or stored codes. The live data looks ok except the long term fuel trim which is at about +10% on both banks during idle, indicating a lean condition. Short term fuel is right around zero. The MAF and TPS values seem to respond fine when applying steady throttle.
So I assume there must be a fairly small vacuum leak somewhere that the PCM is able to compensate for since the long term is only at 10. I didn't see anything obviously wrong, the vacuum lines look fine along the passenger side near the firewall. I sprayed a bit of throttle cleaner along the hoses, intake manifold and gasket area, but could not spot any vacuum leaks. Any other common areas to check for leaks on the 4.0 V6? Perhaps there is something I am missing?
Ford - Explorer :: Got Code PO442 - Vacuum Hose Leak?
I popped a code this morning PO442 emission control evap [small leak]. Would this be a vacuum hose leak? I did both heads about a month ago. Any way to narrow down the troubleshooting on this problem?
View 6 RepliesFord A/C :: 2004 - Vacuum Leak Under Dash When Control Set To Off Or Maximum?
I have a 2004 F250 CCSB 6.0 diesel. The problem I'm having is that vacuum is bleeding off when the control is set to OFF or MAX A/C. I also have no vacuum at the MAX A/C level to close the heater valve. Looking for a vacuum schematic for an 03 or 04 truck with manual controls or how to know what the malfunction is?
View 2 RepliesFord F-150 - 1997-2003 :: Vacuum Leak When Engine Is Under Load
It has been since the 80's that I have attempted to do any work on a vehicle. How do I find a vacuum leak and where is my vacuum canister. I am assuming that it is a vacuum leak for anytime my engine has a load on it the air stops coming out of the dash vents and goes to the defrost vents. I have an 2000 F150 with the large engine with about 112,000 miles.
View 11 RepliesFord F-150 (2004-2008) :: Small Vacuum Leak In 4WD System
Long story short, I have a small vacuum leak in the 4wd system. I disconnected the lines going to the hubs to prevent grinding them to pieces as they are brand new. This, of course lock the front hubs in and disengages the X-fer case in 2wd.
It is not engaging in 4wd unless I select it, so I don't imagine it hurting anything in the X-fer case or anything. Other than the extra rolling mass, is this okay to operate at until I resolve my vacuum issue, provided I close all openings and places for trash to get in?
Ford Aerostar :: Vacuum Leak - Small Crack In The Hose
Searched several times over the winter. Finally tore each hose out one at a time and went carefully over it before returning or replacing.
Turned out to be the long formed semi flexible vac. hose that runs from the gas fumes purge tank control valve group to the throttle body across the top of the engine. Ripped it out, on one of the bends was a small crack all the way thru, apparently would open up wide when stressed and cause problems. Mainly on hill pulls or hard acceleration but not every time. NO hair left after this one.
Replaced, deleted the codes. Runs like a top.
Still amazed at how much power these 4.0L V6 OHV Fords have from low speed on an uphill on ramp drag race.
stirs the old hot rodder blood.
Ford F-150 - 1997-2003 :: 1998 - Air From Defrost Only - Vacuum Leak?
This has been on going for the past year. The blend works fine. Fan speed works correctly. The selection for ac, max ac, etc., will only allow air through defrost vents. Vacuum leak?
1998 4.6 auto super cab