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97 buick lesabre custom, hesitating: replaced iac which was full of carbon, cleaned throttle body, cranked and ran fine. the next morning, it would not idle, replaced tps, then got check engine light code po122 tps low voltage, check volts followed mitchel diag. and said bad pcm. bought a pcm, had it flashed. still showing tps low voltage.where to from here

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6ya6ya
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Posted on Jan 02, 2017

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shaggyrat
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SOURCE: 1909 buick skylark tps low volts trouble code

replace ignition coil make sure by dealer the right mode is used when ordering if not ordered right you will get a difference in engine volts

Posted on Jun 07, 2008

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  • 321 Answers

SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

Posted on Jul 31, 2008

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SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

Posted on Aug 18, 2008

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SOURCE: 1997 buick lasabre custom high idle, transmission, stalling

had same problem i would check the Idel Air Valve and also check all of your vaccum hose lines makeing sure there are no cracks or splits in rubber connectors if there is repair immediatelt because over time they start to dammage the internal parts fo the engine and if youve replace tps mass air etc. sounds like a vaccum hose problem

Posted on Feb 10, 2009

  • 6982 Answers

SOURCE: 95 impala lt1 will stall when warm and not start

On the plus side, when you are finished, you will have a new control system! On the negative side, you just spent more money on parts than if you'd have just taken it to a dealer! I hope you tested those components and determined they have failed. Any codes?
Seems like the only thing you missed is the coil and the temp sending unit (just for laughs, unplug it and see if it stalls out at the same time), or possibly a security system malfunction. Get a decent volt/ohmeter and a vehicle specific manual such as chiltons or haynes. Do some testing, hot and cold and compare your results.You need to determine what is shutting down (fuel, spark or both) Once you develop a "picture" regarding what is happening, you will be more able to find a solution. I can't give you a "fix" on this one only because to properly identify the problem, I'd need to do the same testing I suggested.
good luck

Posted on Sep 03, 2009

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Idle steady 1or2 mi then goes up&down stalls at stops must floor to start car hops & leaps ran rough,now I cant even hop down the rd cause it cranks but wont start


air is getting into the system (repaired parts may not be sealed or mounted and sealed) or the air meter is damaged or not installed correctly.

Dec 18, 2014 | 1997 Buick LeSabre

2 Answers

Clean throttle body air


The accelerator cables? Spray them up good on the outside with a penetrant spray, like WD-40.
The problem with sticking throttle body parts (like the butterfly valve, and the idle control valve) is not carbon deposits, it is coking deposits. This is from air impurities. Remember that a hose from the PCV system is routed back into the air intake-this carries a lot of impurities. Over time, coking deposits will build up. Air passages controlled by the idle control valve will get these coking deposits. I'm not sure how much the internal carbon cleaning helped the throttle body.
I believe I would get a second opinion- I have never heard of an idle valve that can't be taken off and cleaned.

Jan 06, 2014 | 1993 Buick LeSabre

2 Answers

Engine hesitates,no pressure release when gas cap removed on a 98 buick lesabre


Not sure how long ago you had the top half of the engine rebuilt and not sure if this is a new problem and the vehicle ran fine after the top end was done (thinking it was fine then). I have found a number of times that the throttle plate gets carbon deposits on it to where it doesn't close in the proper spot. This throttle body happens to have a screen in it so many people don't physically clean the deposits off and just spray cleaner in there to clean it. Below is a picture of that screen in the throttle body and I marked with a red arrow a snap ring that needs to be removed and that screen comes right out. Spray that throttle plate real well with throttle body cleaner and even manually open it so you get both sides. I even use a soft tooth brush and a rag with throttle body cleaner. Get the trottle plate and the inside of the throttle body including the little ledges that kind of stop the trottle body (you will feel a "lip" in there). After you get it all back together, disconnect the negative battery terminal for about 10 minutes and then start the car. It's gonna be a hard start at first and rev it a few times to blow the cleaner out and then just let it idle for about 5 to 10 minutes. Then maybe drive it for a few miles. Disconnecting the battery cleared how your vehicles computer (PCM) where it thought its idle was set and now is going to teach itself the best idle position. It still going to take about 25 miles and some driving time to totally learn but I think this should help clear it up. Another thing but you will need the proper scanner or somebody who can do it for you and it is called a crankshaft position system variation learn procedure. Hope this helps...

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Feb 18, 2013 | 1998 Buick LeSabre

1 Answer

1998 buick lesabre stalls at times when stop and start acceleration again.


Hi Alan:
You might have an air or a vacuum leak. This is very common! Open the hood and listen for a hissing sound when the engine is running. Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.
If it is hard to pinpoint take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected.

Also, your throttle body may be carboned up and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets lazy and cant keep up with the fast idle changes. Also when the IAC motor is out, I rec to check the passages for carbon build up. If they are plugged they need to be cleaned out.

Possible Causes
Check for air leaks in the Air Induction system (e.g., in the intake manifold)
Check for air leaks in the PCV system and in its related hoses and/or valve
Idle air inlet passage or throttle bore is dirty or full of deposits
IAC valve has failed
MAF sensor is dirty, "skewed" or installed improperly
Throttle plate, throttle shaft or linkage is damaged or sticking
TP sensor is out-of-range or "skewed" high

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day and Merry X-mas.

Dec 22, 2011 | 1998 Buick LeSabre

1 Answer

Car sometimes shut off at stop,turns,and takeoffs


Sounds like your IAC (idle air control) is moving slow, dirty with carbon, you can try cleaning it,
I have had short success with cleaning them and always end up replaceing the IAC. IAC is located at the throttle body.

Jul 27, 2011 | 1990 Buick LeSabre

1 Answer

Vehicle is used for mail delivery. outside temps in the 90s. two&half hours into delivery the engine stalls periodically. after few cranks it starts. temp gauge & radiator ok. oil pressure gauge is...


Clean your Throttle body with throttle body cleaner or Deep Creep made by Seafoam. When the carbon and varnish build up in your throttle body get's hot, it gums up the IAC (Idle air control) valve which help moderate your engine's rpm to keep it from stalling.
If the IAC is stuck due to the gum of the carbon and varnish in your throttle body, you have stalling issues which you have described. Start with that and replace your air cleaner filter since your going to clean your throttle body.
Good luck and be safe, thank you for using fixya and post us back.

Jul 07, 2010 | 1991 Chevrolet S-10 Blazer

3 Answers

97 buick lesabre 3.8 Idles rough and stalls out.


Fuel injectors go bad on these engines, you can find re manned ones for 30 bucks. If you have an engine light on get that read. Change your coil/wires/plugs also. Is the lower intake manifold gasket leaking coolant yet? You may want to get that replaced also. Check the TPS too (throttle positioning sensor) those will also cause your engine to act up

May 08, 2010 | 1997 Buick LeSabre

2 Answers

Starting in the morning cold is a problem. Jeep


The problem is with the engine management system that controls the idle speed for cold starts and pretty much everything else. In the old days the problem would be the auto choke but as this is a new model its the electonics I'm afraid. You can get this sorted out at a dealer. It should still be under warrenty.

Nov 04, 2009 | 2006 Jeep Wrangler

1 Answer

My son says that he starts up the 1996 Dodge Ram pickup and it starts right away but if he doesn't keep his foot on the gas pedal for 30 seconds to 2 minutes or so, the truck dies. It will start up again,...


It could also be carbon build up on the throttle body, but regardless the cure is the same. Your going to need to clean the throttle body and the idle air control valve (IAC). With a can of throttle body cleaner, (follow instruction on the can) clean the throttle body blade and the IAC passage way in the throttle body and IAC. Once the throttle body is cleaned, with the engine off, turn the ignition key to the on position (engine not running) and wait for 30 seconds and then turn if off for 10 seconds and then start it. This should reset the IAC, if it did not work do it again and see if it helps. If not clean out the IAC passage way again. The turning on and off the ignition reset's the IAC and it may still be stuck with carbon build up. Once the engine has started, Note there will be lots of smoke form the tail pipe, that's normal. It's just the left over throttle body cleaner and carbon being burn off, take's not more then 10 min to burn off. Good luck and this should keep you from replacing the IAC. Oh and don't use Carb cleaner, Carb cleaner is to corrosive to the throttle body gasket.

Nov 04, 2009 | 1999 Dodge Ram

1 Answer

Car only stalls at idle at stoplights and only every now and then what do you think?


The Idle air control valve (IAC) is dirty with carbon and needs to be cleaned. You can clean it by spraying throttle body cleaner through the IAC passage way in the throttle body. Make sure you use throttle body cleaner, the carb cleaner is to corrosive to the throttle body gaskets. Make sure you use all of the can and clean out all the carbon as much as you can in the throttle body and look for any damaged wires and vacuum line going to the throttle body. This should fix your idle problem, if problem still there, good chance the IAC needs to be replaced. Once the throttle body has been cleaned, (follow instructions on the can) you may get lots of smoke for the next 10 min, that's normal. The engine is just burning off the residual cleaner and carbon in the engine. Good luck and hope you don't have to replace the IAC.

Nov 03, 2009 | 1993 Oldsmobile Cutlass Supreme

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