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Old 05-02-2009, 04:25 PM   #1
wolfehunter
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1998 SL2
Default Warm air performance?

Been chasing a stutter/hesitation problem when my car is up to temperature. While replacing the radiator (plastic cracked) today I noticed that the clamp at the throttle body inlet end of the tubing was not tight. It was in the open locked position. Probably too easy a fix but took it for a spin and it seriously seemed to run a little better!! At least in my mind and I know it sure as heck wasn't the new radiator making it run any better. My question is this: Since I only was noticing the problem when the car was hot is there a chance it was sucking hot engine air into the throttle body inlet and would that cause any issues?

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Old 05-02-2009, 05:06 PM   #2
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Default Re: Warm air performance?

Loose clamps are never a good thing, especially those involved with the intake. Sounds like you were observant enough to notice that one, and after tightening it down, your car seems to be running better. I think you had a "Eureka" moment, so good for you! Not sure if that's going to be the cure for your operating temp hesitation, but sounds like you're on the right track.
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Old 05-02-2009, 06:50 PM   #3
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1998 SC2
Default Re: Warm air performance?

That could have been affecting the IAT sensor reading and causing an inaccurate intake air temperature signal to the PCM. This will have quite an impact on the actual mixture strength.
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Old 05-02-2009, 07:33 PM   #4
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Default Re: Warm air performance?

It's possible you have a dirty EGR valve. When they gunk up and start sticking they'll cause your car to run lean and act funny. I'd get a can of brake cleaner and clean that out. They don't really go bad, but they do need cleaning every now and then.
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Old 05-04-2009, 10:44 AM   #5
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Default Re: Warm air performance?

Cleaned up the EGR valve. It was pretty dirty. Car still hesitating/stumbling only when up to temperature.

Old Nuc,

I tried adjusting that throttle screw per your instructions in an earlier post. I tried to slowly slide my finger over the air inlet port after the fan cycle but the car would not stay running. I know that I was to be able to close off the port and maintain idle at about 500 rpm's. You had mentioned that it would be close by turning the screw to contact and then opening about 1/4 turn. I just want to make sure this is correct. You did mean closing the screw(clockwise) and then opening it(counter clockwise) one quarter of a turn?
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Old 05-04-2009, 11:22 AM   #6
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Default Re: Warm air performance?

I HIGHLY suggest LEAVING the idle screw ALONE. Your just asking for issues by playing with it.
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Old 05-04-2009, 12:57 PM   #7
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Default Re: Warm air performance?

It's too late......actually messed with it back in December before knowing what it was.......duh! Wish I wouldn't have touched it! Now trying to get it back where it needs to. Live and learn I guess.
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