Question about Buick Park Avenue

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Car stalls at low RMP when under load. It did have a Plenum leak..that has been fixed and the IAC has been replaced, fuel pressure is good. The Map sensor did get soaked? I let it dry over night but still am having issues? Mark

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Check throttle pos sen this will couse stalling at idle and low rpm assuming you have the 3800 gen 2 motor

Posted on Jul 18, 2008

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Leaking intake plenum


I doubt a leaking plenum would cause it not to start. Usually a leaking plenum would cause an air leak and make the engine run too fast.
Any trouble codes stored ? Will it start using carb cleaner spray ?

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2003 ford expedition.. we have already replaced the iac but it is still idling rough when you come to a complete stop.. it is almost like the car is gonna cut off but it doesnt.. what could be causing...


Is the check engine light on? If so have you checked for codes? Do you have a P0171 and P0174 codes?

If so, and your symptom supports this, you may have a vacuum leak. This could be anything from bad plenum gaskets to a rotted out rubber elbow. Normally I would suggest using carb spray to find the vacuum leak but carb spray is flammable and since the coils are on the top side of the engine you need to be really careful not to get it near the coils as the engine could catch fire.

What I would suggest is having the engine smoke tested. This uses a machine that pressurizes the intake system with a low pressure smoke. the smoke will come out of wherever the leak is.

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When turn on the heat/AC, the car stall immediately


This is normally caused by your cars idle up. The idle up engages when you turn on the AC and that will add few RPM for your engine to prevent your engine from stalling. A replacement is needed to fix the problem. You may also check for the vacuum routing sticker on your hood. If you have a vacuum routing sticker on your hood, refer to that. The hose from the IAC valve routes to the Idle Up switch (as you know) the other hose from the idle up switch routes to the passenger end of the intake plenum, right on the end of it toward the firewall side. Don't confuse rubber heat shield on hose for hose size.

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If fuel pressure does not increase when under load the fuel pressure regulator is bad (leaking).

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Engine Light On


If you notice idle getting too low, or car stalling on turns, or when AC /heater is on etc, (engine under load) then yes, probably IAC motor is defective, or dirt in the seat area of it. Only thing to be aware of, is it might stall when off the gas, so be careful when turning, and/or stopping. Have it looked at first chance, but it shouldn't hurt vehicle, just be cautious driving when you let off the gas, it could stall.

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1 Answer

1998 ford winstar 3 litre keeps stalling new fuel pump ,new filter , pressure at rail, no codes, have spark any ideas? thanks


WELL THIS VAN HAS MANY ISUSES NEED TO JECK FOR VACUME LEAK AT IN TAKE AND THE PLENUM IF ITS PLASTICK THEY TEN TO CRACK OR THEY HAVE GASKET FAILER VERY COMEN ON THIS CAR OR YOU MAY NEED TO CHECK EGR VALVE IF STUCK OPEN IT WONT IDLE THEN YOU HAVE THE IAC VALVE IDLE AIR CONTROL VALVE YOU CAN USE BRAKE CLEAN AROUND IN TAKE BUT BE VERY CARFULL FLAMIBAL SHOULD HAVE FIRE EXTINGSHER NEAR YOOU WHEN DOING THIS

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Sounds like fuel problems. Turning your car in any direction has nothing to do with it. I assume your car is fuel in jected. Also that you have had the plugs , wires , cap and rotor replaced. If not do this. Then if you still have the problems the fuel presure has to be checked. That requires an inline gage be attached to check the presure while engine is running. If thats okay, then the fuel presure regulator might be sticking. Of course things like water in the fuel take and filters all need to be checked. Im sorry that its a big job. If you have to pay someone itll cost you money. If they just replace parts (guessing) thats no way to go about it. So plugs, wires, cap and rotor.replace. Then fuel delivery. I suggest you get the book for 15 bucks from autozone. Good luck

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Car stalls when you let off the gas when warm or idling


sounds like your IAC (idle air control valve) located on the throttle body towards the front of the engine held in by 2 torx screws. the iac controls the idle if the car when your not on the gas. i will post the steps to clean the iac and the passages that the iac goes into.

1. disconnect the iac connector
2. remove the iac
3 clean the iac pintle valve and check for wear
4. clean the passages that the pintle valve sits in (usually carbon build-up in there, you may need to remove the air intake tube and air filter box to get to the passages in the throttlebody)
5. if the iac looks ok and the passages are cleaned re-install and put everything back
6. start car and see if it idles like normal when warmed up. you may need to give it a few tries for the iac to re-learn its proper position so give it a few warmup cycles
7. if it still stalls check for proper operation of the iac via ohming out the connectors (if you look it up on google you will find the specs at which the iac is supposed to operate)
8. if the iac is working properly, check for vacuum leaks on the intake manifold and vacuum lines.
9. if no vacuum leaks are present and the iac id working properly after cleaning have a shop check the ecm (engine control module) for a bad circuit board, i've seen that haoppen as well

hope this helps!

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1 Answer

1999 buick park ave 3.8


i am assuming this is a non supercharged car. I have had this problem before be sure to check every vacume line there is a plug at the left end the plentum its a plug for the boost valve (ie. supercharged motor) this has a rubber o ring its orange, you have to twist plug to get it out. Make sure its seated properly adding a small amount of oil to seal to help it seat also pull a vacume on it a see if it holds a vac these motors are twitchy when it comes to vac leaks hope this is of some help. If you had plentom gasket changed check to make sure every thing was tighted down properly take care to look at both ends of plentom one question was the intake gasket replaced also if so permatex is used on the ends so check there also this sounds like a vac leak very small one but one none the less

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1995 ford escort idle problem


Hi , i have a 1995 Escort with 1.9 4 cyl engine , at cold start the engine revs ok but as it get warmer it start to idle rought and die , with a scantool the o2 sensor always reed lean at idle , after checking fuel pressure , air mass meter , EGR valve , and potential vacuum leak at intake and hoses , its the PCV valve that give me that problem , as i remove the pipe with the valve there was a whissle noise comming from it , when i block the valve at its tip the whissle noise stop the engine revs smooter and the o2 reads normal , i replace the PCV and its idling good .

May 31, 2008 | 1995 Ford Escort

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