Ecu Hesitation?

[sLoPrO2k]

After CAI install.... I reset ECU. I know that they say you will experience some hesitation for about 40 key starts or so, but my pro is hesitating a lot! 1st Gear... jerking... and sounds like it is going to die... RPM's seem to fluctuate. 2nd through 5th all just have a bogging like hesitation upon acceleration. Also very very very little throttle reponse at first... then kicks in and I am taking off like a bat outta hell.... Is this the normal ECU restting hesitation? Oh by the way... I have driven for about 60 miles and 2 and a half days now (maybe 30 key starts)... same thing....maybe just a slight improvment. Drives fine... when cold. Any ideas??

[protetype]

sounds like you have a big vacuum leak somewhere. everything hooked up right? double check your work. make sure all hoses and clamps are on good and tightened. also, if this is a 1.6l, clean the MAF sensor with a qtip.. be careful with it thought. There's a couple 1.6l threads about intakes, take a look around and you'll probably find them. I've posted some tips on stopping hesitation before with a CAI on the 1.6.

[sLoPrO2k]

sounds like you have a big vacuum leak somewhere. everything hooked up right? double check your work. make sure all hoses and clamps are on good and tightened. also, if this is a 1.6l, clean the MAF sensor with a qtip.. be careful with it thought. There's a couple 1.6l threads about intakes, take a look around and you'll probably find them. I've posted some tips on stopping hesitation before with a CAI on the 1.6.

Will do.... Thanks.. Oh yeah... what do I use to clean MAF? I mean... what can I put on the Q-Tip?

[protetype]

i personally used alcohol to clean it. rubbing alcohol. just a little bit.

[sLoPrO2k]

Thanks man... will try...

[sLoPrO2k]

Alright... cleaned the MAF sensor... I recently had my fuel system cleaned (3 days ago) and it seems as if there was carbon build up on the MAF from that cleaning because I know it wasn't dirty like that when I installed it the first time. The car seems to be running a lot better, but it is still hesitating.. mostly in first and second gear... unless I go full throttle with it. Do you think that I should reset the ECU now? Can it possibly have a bad memory due to all the hesitation from the last couple days of driving with that nasty MAF sensor?

[McCorkle]

You may as well reset the ECU, it isn't going to hurt anything.

[protetype]

http://www.wihandyman.com/forum/show...&page=10&pp=15 read towards the bottom of the page... my post.

[sLoPrO2k]

Thanks guys... but I have one more question... after a normal reset of the ECU... how bad is the hesitation supposed to be?

[McCorkle]

http://www.wihandyman.com/forum/show...&page=10&pp=15 read towards the bottom of the page... my post.

Good advice. I have been getting terrible hesitation since putting on the evo hood. It is from water getting inside the engine bay. Becuase it only gives me problems after it rains. And I was trying to figure out exactly where the problem was occuring. Sounds like it is around the maf sensor like you were saying.

[sLoPrO2k]

I just noticed.... dont know how I didn't when taking off the MAF... The MAF is missing one of the screws... have no idea where it could be... I don't remember taking it off to clean it... only remember taking one off now that I think about it... I am sure this can be causing a vacuum leak.. right?

[protetype]

its a good possibility...

[MisterT]

1st MP3 of NH has an explanation of hesitation by the ECU in his signature. Go to www.msprotege.com and check it out.

[sLoPrO2k]

Thanks for everyone's help!! Today I went on a 9 store mission searching for a screw for the MAF. Mazda didn't even have one! Anyways, I finally got one (well got a few). Stopped at my local bicycle shop... got an innertube.FREEBIE!!Went home... Cleaned the MAF one more time... made a seal for the MAF. Installed... reset ECU once again... NOW I DON'T LOOK LIKE SOME DUMBASS THAT DOESN'T KNOW HOW TO DRIVE STICK!!! I am up and running again! Thanks again!

[MisterT]

I just noticed.... dont know how I didn't when taking off the MAF... The MAF is missing one of the screws... have no idea where it could be... I don't remember taking it off to clean it... only remember taking one off now that I think about it... I am sure this can be causing a vacuum leak.. right?

How many beers did you have before hand?