Runs when it is cold

[maddog245]

I did disconnect and it did the same thing as soon as it get to temp it falls on its face. Ruley73 said the coolant sensor could have a short. It registers with the scanner the temp so not sure if that is it. I already have bought one so I thought I would try it as when it does die you can smell raw fuel. The friend I have has a 2.8 that is being parted out so I have installed several parts insted of buying all of them. And I have a friend who owns a junk yard so my cost thank god have not been too extreme

[Ruley73]

The reading that you're seeing on the scanner is probably registered by the Temperature Switch (not the same as a coolant temp sensor). It is the same signal that your temp gauge/light receives. It is only the ECM that receives the reading of the coolant temp sensor. I'm glad to hear that you're not out all that much $$$.

[maddog245]

I worked on it again tonite and changed the coolant temp sensor and I had the heat on in the garage and it would not start open the door and while cooling off seen the ground from the battery mount to the trans where the wiring harness connects was caroded so I changed that once the garage was cold the car started right up but as it got warm same ole thing just stalles and would start for a second then dies. Im running out of ideas here, I still need help. Seems I may have to put it on a machine to find out???.

[sierrap615]

what engine is this?

if the problem still occurs with the O2 disconnected, we know its more related to temp then loop mode.

i have heard of the crank sensor going bad only when warm, but after five minutes is insane. i remember some of the 3800 engine have two crank sensors, i don't know which ones. try - immeditily after the car stalls, disconnect the coil/coil packs. see if you have spark. or check the RPM/crank sensor reading with your scantool.(yes i saw that you replaced it before)

[maddog245]

its the 2.8 and on the scanner before I replaced it it was at 28 when the motor was turned off!. I was not able to disconect the o2 sensor as you have to rock the engine forward to get to the plug. This is really getting old I do appreciate your input

[Ruley73]

1988 Regals only came with a 2.8L V6. Fuel Injected GM Vehicles don't have a separate EGR Solenoid. They use a Linear or Digital (depending on the vehicle) EGR system in which the EGR valve and Solenoid are within the same part. No 3800 (Vin C, L, or K) engine has two crankshaft sensors. It was the Vin M 3.1L (first used in late 1993 Olds Cutlass Supremes) engine that had two crank sensors.

One sensor you didn't mention was the Air Temp Sensor in your intake. You should be able to see that reading with the scanner and check that. Also, make sure you reset the ECM after you replace every part. In the W-bodies I know the battery is a pain to get at. You don't have to remove the negative battery terminal to do this. Simply remove the ECM fuse for about 15 seconds. It is in the fuse box under the hood in my '95 Regal. I think they had under the hood fuses in 1988 Regals, but I'm not 100% sure. Does your scanner show that any codes have been stored?I'm assuming not because you haven't mentioned any, but if so what are they? One last thing, does it take almost exactly the same amount of time to stall every time?

[maddog245]

Ruley
There are no codes showing at all and no I did not unhook or pull fuse after replacing these parts thats a very good Idea and cost nothing I will do that first off. Also yes it does die at about the same
time unless it is warm from the garage being heated?? this is a good one!

[maddog245]

where is the air charge temp sensor located on the intake maifold? for the 2.8??. I also pulled the fuse for the ECM (located in the glove compartment fuse box) and it did not work either.

[Ruley73]

The air charge temp sensor is located in your air intake hose between the throttlebody and the MAF sensor.

[maddog245]

I wish it was I would change it. Im getting ready to drop it off at the dealer today hopefully they can figure it out. Thanks for all your help guys. I will post what the problem was providing they figure it out!

[maddog245]

Dealer just called injectors 3 and 5 are bad. Im changing myself tonite hope this does it!.

[maddog245]

Replaced no#3 and no#5 injectors and well all I can say is proper diagnostics is everything car runs great. Thank you for all your help guys