Question about 1999 Pontiac Sunfire

1 Answer

Having issues with sputtering and or stalling

I dont remember the exact code #'s but the descriptions were as follows...throttle sensor, evap (advance said a gas cap could solve) Catalytic (i had the converter cut off) Ok to start a month ago my sunfire started sputter bad and sometimes would stall at a stop and me and my girl smelled the rotten eggs smell (bad catalytic converter from what ive researched) so father in law advised to get it cut off. I didnt like that idea but as the only working parent of 2 I didnt have the money for a new one, so did it...ran fine, albeit loud for two weeks...then three days ago as we were going out it did it, worse than before and would only run fine when i was accelerating. I took it to advance auto parts they ran code test and popped up with throttle sensor, evap system (was told possible gas cap) and catalytic converter issue (most likely due to being cut off) So bought and installed throttle sensor perfectly test drove it and car stalled and lightly sputtered (not as bad) around the block.. Took to a mechanic and he put a bigger snap on computer tester on it and got same codes, reset codes and told me it was fine that it looked like i needed wires possible i bought wires and plugs installed them and right off engine light was back and stalled as well as was weak at a stop when trying to drive... back to advance to check codes again, same codes as last time plus this one - emission system pressure switch low input. I dont know what to do, im on very limited funds, and using bill money just to spend almost $50 on plugs and wires today...any help would be so grateful!!

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  • Anonymous Jul 24, 2013

    $50.00 won't buy a set of wires or a set of plugs on most vehicle & I certainly wouldn't install just the plugs for $50.00 I don't know what you got or where you live but all that sound fishy to me

  • Joshua Vance Jul 24, 2013

    its at advance auto cant be fishy and a good mechanic is no where to be found around here sad to say but true

  • Anonymous Jul 24, 2013

    I'll take that as a compliment of my negative opinion of repair shop results That skilled people left the trade some 20 years ago I meant fishy on the very very cheap price of plugs & wires plus labor I don't see that being done at all for what you paid too cheap

  • Anonymous Jul 24, 2013

    Most people don't suggest the franchise shops There not all bad but a local shop with 30 years & two generations of family there is what you want



1 Answer

I don't know how to answer your question without
a long story
Everything your & any mechanic did was wrong
& a waste of time & money
There are step by step diagnostic steps you perform
in the way of testing for any problem
You have to be prepared to pay for a couple
hours or more to find any or all issues & come up
with a solution
Long story short you need a repair shop that is
the best in your area.
All the code checking,mechanics that talk non sense &
install a few parts to make the boss happy,does nothing
for you,your car or getting to the vehicles issues.
Any time you go to a shop that doesn't road test with
you driving & they have their scanner long,you avoid
Any shop that clear codes,not resets anything,before
a long road test to confirm a repair is a good
to you
No shop should work on a vehicle without a cat, as it
against federal laws to remove it,you have no fuel control
once it's gone.
To have a shop even put a scanner on it without a cat is
a wast of time,you can't get any data you need if you don't
get an O2 Report,you can't control fuel trim,you can't go to
inspection if you have that.

Posted on Jul 24, 2013


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SOURCE: 1999 3.8L V6 Firebird - Cyl 6 misfire, stalls at idle, hard start

look at spark plug 6 see if it is foul out with oil. when you first start you car up and it smokes blue you have leaking valve seals and stop up oil return holes.if all is good .check 6 injector make sure its getting power.

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SOURCE: 1998 Pontiac Bonneville SE 3.8L Backfires/ Sputters

sounds like the ignition module is going bad.

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none fire on plug and the coil and the mdule ers good

Posted on Sep 02, 2009

  • 1868 Answers

SOURCE: I have two problems with my 05 Grand Prix. (Misfire & Evap Leak)

Hello! There is a device called a purge valve; located in the back/right of the engine compartment next to the throttle body. The original fault was a "mass evap. leak code. Changing the gas cap was the correct, least expensive move. The purge valve is the likely culprit. If the catalytic converter was at fault a code indicating; Cat., or O2 sensors would have been set. If the valve can not open to purge the vapor pressure will give the faults you are seeing. Also if valve remains open auto will not run right anyway. Evaporator problems are unrelated to converter trouble. I suggest you replace the purge valve. There is also a vent valve located back by the gas tank; It is a part of this very complex system. Give that valve a good visual inspection (broken or worn wires/connectors or loose hose) before you purchase the purge valve.


Posted on Dec 10, 2009

Testimonial: "Déjà vu. They mechanic that solution 1 pointed to pretty much told me exactly the same thing. Thanks so much!"

  • 1608 Answers

SOURCE: 260,000km Car looses power and

Did you do anything to repair the mas air flow sensor code or did it go out by itself?If you did not replace it or clean it you should get some mass air flow sensor cleaner and clean it out.You can get this at most part stores.If you are getting this code then you need to repair this problem.This will cause the car to loose power and it can be intermittent.Hope this helps.Good luck.Let me know if you have anymore questions.

Posted on Sep 21, 2010

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