Car won't start?

Tiny
BRIANDD1@COMCAST.NET
  • MEMBER
  • 1997 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 65,000 MILES
It starts up and runs fine but it's a crap shoot when you shut it off whether it's going to start again or not. But if you wait long enough for it to cool off it will start. So whatever gives it gas to start after it's warmed up is working intermittenly. Don't you think?
Do you
have the same problem?
Yes
No
Monday, June 22nd, 2009 AT 11:24 AM

104 Replies

Tiny
2CIXPT
  • MEMBER
Check the fuel pressure and comeback with the readings we start here with this guide

When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

Was this
answer
helpful?
Yes
No
Monday, June 22nd, 2009 AT 11:43 AM
Tiny
LEOPUDLO
  • MEMBER
I had an identical problem with a 1997 Dodge Intrepid - solution turned out to be a fuel pump replacement.

This is after hundreds of $$$ in diagnostics, fuel filter and replacement of all four O2 sensors. Which did not help at all.

Car is running perfect for a year now after the fuel pump replacement!
Was this
answer
helpful?
Yes
No
Thursday, June 25th, 2009 AT 1:50 AM
Tiny
TU6EDRIVER
  • MEMBER
  • 1997 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 110,000 MILES
Hi,
Recently this car overheated and shortly thereafter (30 Minutes) suddenly just stopped dead. Had to tow it 250 miles home.
I've replaced the CPS. It gets spark to the plugs, fuel pressure is good.

Will NOT start even with starting fluid sprayed into the intake while cranking. No correct firing at all. Once in a while a random backfire, but not often. Just acts as if there is no spark, however there IS. Fuel pump replaced less than 4 months ago and pressure is GOOD.

Car was running beautifully when over heating was noticed. I immediately added coolant and it ran for another half hour, then suddenly NOTHING. Heard that the CPS can often be damaged by overheating so replaced it.

I've worked on cars for 40 years and I'm truly baffled.
Any help would be appreciated!
BK
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Hi tu6edriver,

Thank you for the donation.

Did you test the compression?
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
TU6EDRIVER
  • MEMBER
Yes the compresssion is good.
The car has had excellent maintenance, etc. I've never had a situation where there is fuel present and spark with virtually no indication of even random firing. Even if the timiing was ramdom, false firing should happen. Still investigating when I have the time. The car has become a driveway ornament for the time being.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
As sparks, fuel and compression are available, it definitely is a mystery why it is not starting.

Are the sparks strong ( bright blue?

Other things that could affect starting would be the Engine Coolant Temperature sensor, MAP or MAF and major vacumn leakages. Did you try starting with throttle opened at different positions?
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
MICHAEL REDMOND
  • MEMBER
  • 1997 BUICK LESABRE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Car won't start. I replaced battery about 3 months ago. When I turn ignition; lights, radio, etc. Operate as usual, but the engine makes no sound to turn ov er (i.E., I don't think it's the battery).
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
2CIXPT
  • MEMBER
Get the battery and alternator load tested if both okay make sure cables/posts are cleaned and properly tightened. Problem continues to exist, check and test the Airbag/VATS fuse 2E 10amp in I/P fuse block behind left side of dash,starter,starter enable relay located behind the dash left of steering column - park and neutral switch on the left side of transmission and ignition switch


https://www.2carpros.com/forum/automotive_pictures/12900_buick_start_circuit_1.jpg

Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
BIGTTMAC99
  • MEMBER
  • 1997 BUICK LESABRE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
There is periods of time the vehicle will not start is it a problem with the engine or a problem with a starter
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
Check starter and battery + terminals
check if alrarm related
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:05 PM (Merged)
Tiny
PCDJ64
  • MEMBER
  • 1997 BUICK LESABRE
  • 127,000 MILES
I had diagnostic done, no problems with the sensors as far as readings etc.
No vacuum leaks, no bad connections, no codes pending or stored.
Car starts right up when it is cold, once engine is warm it will immediately shut off when it is started a few times before it finally stays running, the tach will fluctuate between 1000 and 1500RPM a few times before it settles at around 700, after that it runs perfectly and drives great. If I let it sit until engine is cold it will again start and run great 1st try.
Fuel pressure is right on the money. Everyone who has tried to figure it out is stumped, was also told that if it was the PCM the car would never run right.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
HMAC300
  • MEMBER
Try cleaning the throttle plate with choke cleaner on both sides and make sure no holes in air ducts.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
PCDJ64
  • MEMBER
Brand new upper intake was installed and throttle body is like new.
There are no leaks anywhere
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
HMAC300
  • MEMBER
The only thing I can think of is to check cam and crank sensors for ohms. It may get hot and not want to run right or have to many ohms creating to much resistance. We dont' have info for them so check against new. Or if someone has a resistance chart for those.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
PCDJ64
  • MEMBER
I could check the sensors, it is worth a shot.
I can get the values to go by for the resistance.
If I hold the gas a tiny bit when I start it it will stay running.
I changed the IAC and TPS and they test good.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
HMAC300
  • MEMBER
Well the cam and cranks sensors alot of times won't set a code bu still can be screwed up. Also with the fuel pressure did you check it after the engine was off and let it sit to see what happened?
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
PCDJ64
  • MEMBER
It had a problem last month with fuel pressure, the pump was shot and I ended up getting a new tank, sending unit with the pump, filler neck, fuel filter and pressure regulator, I opened a can of worms with the rust that was on the old stuff.
The regulator was changed because the old one was malfunctioning.
I know the sensors can be bad even without a code, I ran into that with the MAF. The garage initially told me to change the TPS because with very little pressure on pedal it will stay running, you release and it goes to 700RPM. It is a very nice running engine, tons of pickup and smooth. Only issue is starting, I am not an expert by far but it almost seems like the PCM is not picking up the initial pulse from the crank sensor to start the firing order and holding the pedal a little gets the engine to stay on long enough for it to catch up. Probably way off but it is an educated guess anyway lol.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
PCDJ64
  • MEMBER
To add to the already screwed up car, it has 3 new premium quality coils, new bosh premium wires and irridium spark plugs, the PCM is not reporting a misfire but there is one, engine is running a little bit rough and you can hear the miss when you are at the back of the car. It is running on all 6 and has power.
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
PCDJ64
  • MEMBER
I exchanged the plug wires for new ones under warranty, seems to have gotten rid of the misfire.
No one can tell me why the car will not stay running when I start it warm, with all of the work done it will no longer shoot up to high idle or fluctuate much on the tach but unless I put a little pressure on the gas it will not keep running when it is started warm. After about 10 seconds I can release gas and it runs fine until next time I have to start it again. Always starts fine cold.
No check engine light, no vacuum leaks, no bad connections, fuel pressure is where it should be, plenty of power. Everyone is stumped, the only thing that it could be is a bad PCM I am being told. I looked at the PCM there is a little panel with 2 hex screws, is that where the chip is to switch to a new PCM?
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)
Tiny
HMAC300
  • MEMBER
Pcm is an exchange unit
Was this
answer
helpful?
Yes
No
Tuesday, August 4th, 2020 AT 1:06 PM (Merged)

Please login or register to post a reply.

Sponsored links