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Accelerator/takeoff/rev Problem

ossie_21

By ossie_21,
in Engines & Forced Induction

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ossie_21 Grand Master

ossie_21

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Posted

Can't find much in a search but then again I'm not really sure on what to look for so here goes.....

I noticed it yesterday & it was worse today, but when I go to take off, the revs will all of a sudden drop & almost or does stall. I stalled 4 times today, and since I have had my car I had stalled once, so that gives you an idea something is wrong.

As I am coming off the clutch & put revs on, it all seems normal until the revs just drop. This afternoon on the freeway I was doing 100 & took my foot off the accelerator & back on, and there isn't an instant reaction. It's the first time this has happened.

Then tonight I took it for a drive when there was less traffic to see if I could get an idea, it was the same. I even tried to hold the revs steady at 3k, and it was rough going up & down. I popped the bonnet & used my hand to rev the engine, and the revs would drop before going up. It's like a lag thing going on, it takes a second before doing anything & it's got me stuffed.

I'm hoping that someone has maybe had this problem before & can tell me what is going on & whats needed to fix it, I will try to get it looked at tomorrow anyway but I'm hoping it's something easy ;)

My car has done 90,000k, it still has the original timing belt (just over 10yrs old) it's starting to make a sort of knocking sound & will be replaced shortly anyway, could this maybe be the problem?

Any advice/ideas/beer would be welcome, thanks.

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https://www.sau.com.au/forums/topic/105739-acceleratortakeoffrev-problem/
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Craved Grand Master

Craved

Posted
Posted

check all your intercooler piping for leaks/cracks.. sounds alot like how the car acts when my IC pipes blow off ..

somewhere to start anyway.

does it blow any smoke? can you hear an air leak when reving with your hand?

ossie_21 Grand Master

ossie_21

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Posted

Managed to suss it all out today, was a problem that would have happened eventually anyway. All came down to a flat spot because no fuel was being delivered with what I mentioned.

Really shit at electronics & wiring :( , but one of the wires running from the wolf3d had a problem, and it was telling the fuel pump not to put any fuel through, so this made the flat spot at idle/takeoff. There was no fuel pressure here, and after a few ideas we checked what it could be but traced it back to the ecu. A bit of cutting the problem joiner & soldering the wires back was all it took.

Strange because it was fine when cruising, but at idle was stuffed. To fix it just needed trial & error.

Then when that was all sorted, started it up again & was fine, except then it was blowing black smoke from the exhaust. "Oh shit" I thought, so went to the tuner's shop (noticed the car wouldn't boost either) because we thought it would have to go on the dyno, waited while a car got a safc tune, then when the tuner went to bring in the car saw the smoke, immediately knew the map sensor line had a kink in it & it was problem solved :P

Turns out when the ECU was put back into the kick panel that was where the line got bent. I had a smile on my face all the way home today, no stalling, no delay with acceleration & got my 350hp back with no dramas. :lol:

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