Hot Start Issue / Flooding

FRED · 07-20-2011, 10:05 AM

During the start process the ECU does not use the afm for fuel delivery. It uses an internal fuel map that determines how much fuel is delivered during start and uses the water temperture to decide how much is used during the start procedure.

There is no way for you to fix this fuel map other than buy a RTEK.20 or aftermarket ECU. There are ways to TRICK the ECU to use the afm for fuel delivery during the start process and that will result in less fuel being delivered with a hot engine and thereby a better start of the car. Unfortunatley if you trick the ECU to use the afm instead of the internal start fuel map........cold starts will be more difficult. Cold meaning water temps under ??? 120* on the whole.

This Trick is nothing more than NOT letting the ECU see the Start signal when you hold the key to Start. It more or less consists of depinning the wire on the ECU that sends that start signal to the ECU.

That or build a fuel cut switch I guess. I don't know what your abilities are when talking about depinning a wire from a ECU plug. I'd never cut a wire. No need to do that.

ROT8TOR · 07-20-2011, 11:07 AM

So, do you want me to replace the N351 unit under the passenger floorboard?

Could this malfunction be caused from mixing positive & negative on the battery when jump started? AAA came out after I killed the battery trying to start it and beknownced to me... he had em momentarily crossed. ???

I really don't think this is the issue, just because I felt it was a more fuel than electrical issue, like a leaking injector.

It may not be the case, but I swear I smell BAD gas coming from the car.

07-20-2011, 10:05 AM	#1
FRED Rotary Fan in Training Join Date: Mar 2011 Posts: 73 Rep Power: 15	During the start process the ECU does not use the afm for fuel delivery. It uses an internal fuel map that determines how much fuel is delivered during start and uses the water temperture to decide how much is used during the start procedure. There is no way for you to fix this fuel map other than buy a RTEK.20 or aftermarket ECU. There are ways to TRICK the ECU to use the afm for fuel delivery during the start process and that will result in less fuel being delivered with a hot engine and thereby a better start of the car. Unfortunatley if you trick the ECU to use the afm instead of the internal start fuel map........cold starts will be more difficult. Cold meaning water temps under ??? 120* on the whole. This Trick is nothing more than NOT letting the ECU see the Start signal when you hold the key to Start. It more or less consists of depinning the wire on the ECU that sends that start signal to the ECU. That or build a fuel cut switch I guess. I don't know what your abilities are when talking about depinning a wire from a ECU plug. I'd never cut a wire. No need to do that.

07-20-2011, 11:07 AM	#2
ROT8TOR The Newbie Join Date: Jul 2011 Location: Charlotte, North Cackalacky Posts: 18 Rep Power: 0	So, do you want me to replace the N351 unit under the passenger floorboard? Could this malfunction be caused from mixing positive & negative on the battery when jump started? AAA came out after I killed the battery trying to start it and beknownced to me... he had em momentarily crossed. ??? I really don't think this is the issue, just because I felt it was a more fuel than electrical issue, like a leaking injector. It may not be the case, but I swear I smell BAD gas coming from the car.