Erratic acceleration - 99 Accord i4

[xci.ed6]

Odd, P0300 = any cyl, P1399 = all cyl?

Whatev...As far as replacing it goes, with the new symptoms, usually the IAC is only a prob when it can't move, like when it was dirty, and doesn't (usually) result misfiring only. And the IAC only affects idle, not any open-throttle conditions, like 20mph.

So it kinda sounds like you have another problem, maybe ignition related. Make sure the plug wires work ok, distributor, etc...

I do have an intermittent P030x problem *I think* may be the coolant temp sensor, it only happens about 1x per month, so I've missed my chance to diag, but it also only happens at idle, for ~2 minutes, from a hot-start (like running into the gas station).

I mean, you only have P-codes for misfire, so it MUST be a 'secondary' system problem or like my problem, which is (again, I think) a sensor who's output is 'within specifications' but wrong.

I hate it when you get problems like that, you have to LOOK at sensor outputs (OBD or oscilloscope or voltmeter) and compare them to reality (mine is an 'infrared thermometer')

 

[xci.ed6]

Oh, EGR if stuck open, can act like an idle prob, and can act like a 'moving' problem.

I would also remove and clean that, and the passages!, before trying to hard to find this. I mean, it takes like 1/2hr.

For cleaning the EGR, carb cleaner (not TB cleaner) and wire brushes will help.

 

[schmiddr2]

I had some of those codes and the fix was changing the plug wires.

 

[briansan]

Stealer ship lol...
Dang man, im sorry that youve put in so much money to your car and it's still not functional...
With 10+ yr old cars, rust begins to play a serious role in its performance and functionality


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[teflondan]

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