Weird things happen when I change timing..?

zZsKyZz · Aug 5, 2006

I put my timing up a bit last night and my car doesn't seem to want to idle correctly, it searches between 500-1000 rpms at idle, and sometimes wants to die out.. Also, sometimes it has trouble starting. My gas mileage is horrible now too.. It doesn't ping or anything though..

Wtf did I do and how do I fix it?!

HISSIN50 · Aug 5, 2006

How many miles did you drive it last night to figure gas milage sucks because of the bumped timing?

Advancing the timing can raise the idle and the puter can fight the higher idle by decreasing IAC duty cycle, which can cause surging. WIth no idle spec posted, that's just info.

It has trouble starting when hot or cold?

Did this all happen after advancing the timing or were you hoping that the timing change would help existing issues?

Obviously more info will help.

Good luck.

zZsKyZz · Aug 5, 2006

I was at island dragway and though increasing the timing would help my 1/4 mile times. Right after I did it I noticed the car bogging down a bit, but a little bit of a faster time. The car does it when it's both hot and cold. I drove about 50 miles back home and 20 to/from work today. It took about 3/4 of a tank and I got 150 miles to that 3/4 tank... Normally I get about 220-250 miles per gallon.

HISSIN50 · Aug 6, 2006

zZsKyZz said:
I was at island dragway and though increasing the timing would help my 1/4 mile times. Right after I did it I noticed the car bogging down a bit, but a little bit of a faster time. The car does it when it's both hot and cold. I drove about 50 miles back home and 20 to/from work today. It took about 3/4 of a tank and I got 150 miles to that 3/4 tank... Normally I get about 220-250 miles per gallon.

Well, you're not going to better that - I'd change it back ASAP.

I'm gonna bow out on this - too many variables. I wouldnt interpolate anything from a stock gas gauge, nor that little milage, nor measuring milage with track runs made. And if timing was bumped right before the run, something else could be the cause and the timing-bump was coincidence.

I'd pull codes to start with. I know if I had ideas, they'd be fairly wild guesses (for the reasons posted above).

Good luck and bump.

zZsKyZz · Aug 6, 2006

Thanks, I'm gunna toy with it today.

Weird things happen when I change timing..?

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