Trans Sport :: 1996 3.4L Van - No Start Intermittently / Fuel Pump Relay Chattering
I have a 1996 Pontiac Trans Sport 3.4L (without Passkey anti-theft) which on occasion won't start after being parked. The fault only happens when the vehicle has been sitting, it does not die while being driven (so far). The engine cranks normally but does not fire. The peculiar and significant thing about the fault is that the fuel pump relay (driven directly by the PCM), chatters at about a 10 Hz rate. Instead of receiving a steady 12VDC to keep it energized, it is receiving a pulse stream from the PCM.
The first few times this occurred, I heard the relay "chattering " under the hood , and was able to start the van by unplugging the relay and shorting the connector terminals for the contacts together with a wire jumper ( these terminals connect "hot at all times" 12VDC from the PCM fuse (orange wire) through the relay contacts to the fuel pump +ve). The electric pump would run and I could start the engine easily. By the time I arrived at my destination, the fuel pump relay 'drive' would be normal and I could plug the relay back in and continue normal operation.
The last few times this problem occurred, the van would not fire -- no spark as long as the relay drive was pulsing. When it would finally go back to normal operation of the relay, the engine would start OK.
Last Spring in cold weather I had the van towed 2 blocks to a Pontiac dealer with this problem. The problem resolved before they inspected it; however after the Technician's inspection the Service Advisor said there was no fuel pressure at the test port and that the pump must be deffective (shorted), overloading the relay causing it to chatter. That diagnosis made no sense to me. They wanted to replace the fuel pump as the solution ($600). I got past the Service Advisor and asked the mechanic to show me the fuel pressure -- the car started on the hoist when I tried it, and fuel pressure was normal (>30psi). I left with just the relay changed, as they thought the original would have burned -up contacts from excessive current to the pump. (I cut it open later and found its' contacts to be perfect). While at the dealership I asked the S.A. if he knew of any TSBs, or other incidences of this problem; he said he had not heard of this problem before.
I had the same problem one week later, but not again all summer until this Fall's cold and wet weather. I had to have the vehicle towed home and it still wouldn't start the next day. As soon as I accessed the PCM behind the glove box and jiggled it the relay chattering stopped and car could start. However, later the same day, still in the driveway, the fault was back and no amount of jiggling or other manipulations had any effect. Later still I went out to test for spark, and the fault was gone. (Cold, wet weather all day).
Vibration seems to have little effect. I have checked the PCM connectors' security and pulled, twisted and wiggled the wires coming from it, as mentioned above, to no effect. I suspect the fault is inside the PCM and is thermally induced by cold weather. The next time it happens I will try a warm hair dryer on the aluminum housing of the PCM. I wonder if there is a fix for this (repair a cracked solder joint, etc.) other than replacing the PCM. I work in electronics, and will open the PCM up and inspect it before forking out for a new one.
Trans Sport :: 1992 Pontiac - Cylinder 6 Not Firing When Engine Hot
We have a 1992 Pontiac Trans Sport with the Chevy 3.1 V6 TBI engine.
Engine was running poor because of a faulty Coolant Temperature sensor (rusted-out pins). Changed the sensor and cleaned-out rust from the socket and now it runs smooth when cold with decent acceleration.
Problem is that cylinder #6 is not firing when engine is hot at operating temperature. Engine shakes lightly but performance remains good.
Distributor, rotor, spark plugs, spark plug wires and Oxygen Sensor were all changed 1 week ago with new ACDelco parts. What to check next?
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?
Trans Sport :: Pontiac 2.3 16v- Engine Stopped When Driving / Could Not Start
2800rot./min when driving. engine showed signs that he drowns, I joined, he went shortly after that began to fall speed and the engine stopped. Then I could not start. Come to be fuel, received a little dirt somewhere and no longer feeds? What can I do?
View 3 RepliesTrans Sport :: Pontiac 1996 - Engine Starts But Stop After 2 Minutes
When is cold, the engine starts but stops after 2-3 minutes. I can not start until after standing for 2-3 hours, and again stops.When I try to start, signs that would not fill with gasoline.What should I check first, what should be changed?
It was....now engine don't start!
Pontiac Trans Sport 1996,2.3l,16v,Quad4 DOHC
Ford Super Duty (1999-2016) :: F250 5.4L - Engine Won't Start / Fuel Pump Relay Failed
I see several threads regarding engines that wont start for no apparent reason. My reason was a failed fuel pump relay. This sucker is hidden in the dash below and to the left of the radio. I got to it by taking out the ash tray. There are three relays under the cover. The upper left is the fuel pump relay. The one to the right is the turn signal relay. I don't know what the bottom left is for.
View 3 RepliesTrans Sport :: 1992 / 3.1L Started Quitting While Driving
My 92 transport 3.1L had started quitting on me while driving. After sitting for about 15mins I could get it started and then continue on driving. Now its doing it more and I can't take the chance of going anywhere in it.
Got a CEL so I flashed codes 34, and 45. Where to start troubleshooting with what these codes are saying that I should do?
Ford Super Duty (1999-2016) :: 2002 - Gas Engine Won't Start After Replacing Fuel Filter / Pump Relay / Air Filter?
After replacing fuel filter, pump relay, and air filter for good measure my 2002 f250 v10 gas engine still wont start. What to do?
View 13 RepliesTrans Sport :: 1992 - Electric Windows Started Going Up In Hops
Suddenly both electric windows started going up in hops on our '92 Pontiac Trans Sport SE.
If you leave it for 5-10 min. it would resume normal operation then it freezes again in a few seconds and so on.
- window buttons (left and right) checked-out ok
- driver window motor was changed an year ago - it doesn't have the same wear as the other motor
- both window lift mechanisms and guides are properly lubricated and work smoothly
Trans Sport :: 1997 Pontiac - Loss Of Oil Pressure When Traveling Down The Road
I have a 97 Pontiac Transport and I was traveling down the road and suddenly i lost oil pressure the light came on and it started clattering so I checked the oil level and it was fine so i had it towed home. I changed the oil using a higher grade oil and lucas oil treatment and started it ...I still have the problem what do i do...
View 7 RepliesTrans Sport :: Engine Stopped Twice In 2 Minutes After Initial Start
Last week, the engine stopped twice in the 2 minutes after initial start....but then managed to take me back home. Was away for 1 week (not with TS) then when back , tried to start ...no joy.
This duplicates a similar event 8 years ago...solved with the ignition module being replaced.
[URL] .....
NO codes.
There are 2 options: crank sensor or ignition module. Will go for some tests and will report.
Ford - Explorer :: 1994 - Crank But Won't Start - Fuel Pump Relay?
Sometimes after running my 94 Limited, it doesn't want to start - it does crank - like it's not getting fuel. I have found the work around and want to know if it would be fixed by replacing the fuel pump relay.
The symptom is just after starting, it starts to run poorly, and then dies out, then will not start at all. I use to keep trying to start it for 20-40 minutes and suddenly it seemed to work.
It seems the work around is to turn the key to on for about 5 seconds and then turn it off - then it starts and runs as good as ever.
So, is this a symptom of a bad relay? I thought I'd start there because of the cost of the relay is fairly cheap. 1994 Explorer Limited 4x4?
Ford Excursion :: Replaced Battery And Fuel Pump Relay / Only Crank / Won't Start?
Black Beauty finally gave up. Replaced battery, replaced fuel pump relay. Would only run with starter fluid sprayed into the air intake. She'll crank but not start. Here she sits at the dealership.
View 14 RepliesFord F-150 - 1997-2003 :: 1999 - Won't Start After Sitting For Month - Fuel Pump Relay?
1999 4.6L won't start after sitting a month. Ran fine before, now won't start. Cranks fine. Cannot hear fuel pump turn on when key is turned. Fuel pump fuse is good.
Fuel pump relay clicks a few times when key is turned. Is this normal? I am hoping it is the relay and not the pump. What should I check next? The wires at the pump? What should they read?
Ford Wiring/Electrical :: 1992 F250 - No Start / Fuel Pump Runs All The Time When Key Is On
My 92 F250 5.8 won't start but fuel pump runs all the time the key is on. Some times it runs. But has no power and check engine light is on.. But I cant get it to flash codes, only steady light on.. It did this before then ran good. Now back to no start.. I checked grounds and relays ..
View 2 RepliesDodge - Gasoline - Pump - Relay - Dart :: 1971 - Fuel Pump Not Working?
ok, i just became the proud owner of a 71 dodge dart.. fuel pump was not working, and am converting to an electric (airtex e8016s) and am told i need a relay. airtex doesn't seem to have one, is there another i can use? fairly new at this sort of thing, but have fixed a 72 honda motorbike, so not afraid of engines or whatnot.
View 19 RepliesFord Super Duty (1999-2016) :: 2004 F250 5.4 Engine - Fuel Pump Relay Location
Its it true, that the fuel pump relay is hid in the fuse and relay box, and non serviceable ?
View 6 RepliesFord Fuel System :: F250 Not Getting Voltage To Fuel Pump Relay
My F250 heavy duty isnt getting voltage to the fuel pump relay.....
View 2 RepliesSanta FE SM (2001-06) :: V6 Showing Error Code P2100 - ETS Relay?
My Hyundai Santa Fe 2006 V6 3.5L shows error code P2100. I cannot for the life of me find the ETS relay. Ive scoured the net but just found vague drawings and pics that didn't show ETS relay. I would also like to know is the ETS relay also known as the fail safe relay or is that a separate relay. Ive seen pics of the fail safe relay but none for the ETS relay. If there is such a relay, exactly where it is located?
View 2 Replies