Question about 2002 Saturn Sl

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It sounds like your intake manifold gasket. These cars are well known for this. Get a can of either brake cleaner, or engine cleaner. While the car is running, spray the cleaner directly onto the gasket where the intake manifold bolts onto the back of motor. Most of these cars leak air between cyl. 1 and 2. there are 9 nuts holding this on. If you hear any change in the idle while spraying, you will have just confirmed that the gasket is the problem. Let me know how you make out, and if you need, I have this complete change on video. Its a cheap change and easily done let me know how this test goes, and if it's not the problem I can teach you how to check the Air idle, throttle positioning , and EGR sensors. Let me know

Posted on Jan 21, 2013

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1998 Ford Contour 2.5 litre, 30,000 km. Started cold after sitting for a day in -20C temperature, and idles for little while then quits, and smells like gas. Idle speed fluctuated and surged up and down...

PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5

the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty

missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure
sorry forgot to add that its says missfire on #5 cant remember if that one is the first on the left or last on the left facing the engine vacummn leak could be those dang auto hubs got it stuck in the mud and they did not engage I need to buy some new ones took them apart to clean them out this summer

Dec 16, 2013 | 1999 Ford Contour

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Hi Alan:
Your problem sounds like a sticking IAC (Idle Air Control) valve. It is located under the Throttle Body on your vehicle. You have to remove the Throttle Body to get to it...


You can try cleaning it but the problem may come back. The sea foam will not clean it because no fuel goes through the valve, only air.
Additionally, its possibloe that you have a vacuum or intake gasket leak or a secondary ingition missfire. I would first check for correct fuel pressure and inspect fo a vacuum leak. Also, scanned the PCM to know if have some fault code stored.
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

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2002 accent p0171 lean mix and cyl 1 and 3 missfire cant find any vacum leaks any ideas was going to try frount 02 sensor

bad oxygen will idle speed also clogged fuel filter,faulty fuel pressure regulator, dirty fuel injectors will cause engine to rough idle.

Dec 06, 2011 | Cars & Trucks

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Car sucks at idle and wont go over 40mph. has a p0300 code

Hi, have you done a fuel pressure test ,a bad fuel pump or stopped up fuel filter can cause a missfire code. your p0300 is a random missfire code. If you dont have enough fuel pressure to the injectors it will missfire because of not enough fuel . I dont now what your fuel pressure should be because i dont know what engine you have. If have any more question please re post.
Thanks dodge tec

Jan 04, 2011 | Chevrolet Malibu Cars & Trucks

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I have a 98 dodge ram 1500 with a 5.2L. I got a code of p1391. i changed out the crankshaft sensor, and still wasnt working right. I was then told to change out the computer, so i did, and still not...

try cleaning the throttle body, iside of it take a tooth brush and carb clean and scrub both bores especially were the plates rest at idle. the code is a missfire code. dirty throttle bodys cause all the problem you mention and then some.

Sep 02, 2010 | 2000 Dodge Ram 1500 Truck

1 Answer

BMW 523i 1999 model

your car is not suppose to idle at 500 rpm . 800 to 950 is the proper idle, unfortunately it is controlled by the computer. have you checked the idle speed control valve? also check the air flow meter

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1 Answer

99 suberban missing at idle after warm

Code shows missfire on No 1 cylider. When engine is cold it runs a rich mixture. If the missfire is still No 1 then check for vac leak on manifold. Perhaps a vac line or intake gasket.

May 27, 2009 | 1999 GMC Suburban

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