Ok well i keep frying ecu's....i don't know why but i am, i am hunting the "short" that is causing this. I am buying a new harness and what not. Anyways today i was driving and for the first time since my car has been acting crappy (ECU wise) I turned on the climate control to get some outside air flowing.....when i did I just about crapped my pants.....

The TAch started jumping around, the car bogged down and died, i got it started but the car wouldn't accelerate anymore...it just was like waaaaaaaaa..die waaaaa, and then i switched off the climate control and it went back to normal driving..... I have opened the ecu's and will post pics soon but i can't see any visible damage, other then a 1k ohm reistor that is a little brown.... Any ideas or similar problems... Thanks any help is always appreciated...

 

condenser (capacitor) in the ignition circuit shorting to ground? near the trailing coil...that would effectively suck juice from the injectors, also, causing the bogging

 

near the trailing coil....can someone tell me exactly where it is and what it looks like?

thanks 88na...i need all the sudjestions i can get..

 

well, it should look like the one for the oil pressure sender circuit, which is the one on the clutch slave cylinder...but the one you want is tucked under the trailing coil pack, I think...try disconnecting it from ground & see if it helps anything, just don't be surprised if you get a lot of static on the radio...

 

I think i unhooked the right thing.. single wire clip right? little black box... It didn't make a difference... humm thanks for the try though..

 

RRTEC, I only see 2 wires going from the climate control to the ECU, and these are for the A/C relay and the Refig. Switch. I think it unlikely this would be the problem. It occurs to me that when you turn on the fan, a large current will flow. If your battery, alternator or grounding are faulty, the battery voltage seen by the ECU could drop below its "running voltage" threshhold, resulting in the symptoms you describe.
So, check your battery voltage and the ECU supply voltage with the fan running.
Let us know what you see.
As far as blowing ECU's. An intermittent fault is the hardest to find (Ha! you already know that!). I'd suggest looking at the ECU that is blown, to see if you can isolate the (probably) output stage that is open. Is it the +5Volt to the sensors still there?
Good luck with this one, Dave

 

lemme ask you a Q- would the battery effect it while driving? I though the alt would take care of it...I am just wondering if maybe the ecu is just so shot that it is affecting every aspect of the car...

 

yep still clueless

 

yep still clueless

 

need more info,man...the tach jumping/ car bogging sounds like a short in the EGI system (when you turn the climate control on-wtf?), which may/ may not be responsible for frying the ECU (they were frying BEFORE you had the a/c incident, right?)...have you pulled any codes yet? injector impedance/ harness match the ECU you're using?

 

Yeah i used the same ecu n326 as came from the factory. I haven't replaced the harness yet....

I have regrounded the whole car and this "electrical problem occured After i replaced the exhaust and fuel inlet sock.....

It really sucks...

I have ohmed out the injectors and they are great. They were rebuilt durring engine rebuild. I have replaced teh injector capacitor deal under teh air box..The climate control thing..not sure. I just now turned it on for the first time since before the problems started.

 

man, doesn't make sense...you didn't cut or chaff any of the fuel pump wiring harness when you pulled the pump? no fuses are blowing? cleaned the grounds? I don't know! What I would do, though, is go over everything I touched (or MIGHT have touched) just before the car started acting up...sometimes I think our cars would run fine forever, if we'd just leave them alone

 

Ain't that the truth

 

new strange happenings.... I filled up with gas just now on my way home from work..(picked up a brew too) and the car hesitated in neutral..it never does that.. it always rev's freely in neutral and bogs under load..wierd.. I wonder if teh fuel inlet sock is all clogged up again? And when i shot the new gas in there it stirred all the crap in the tank up....this didn't happen untill i premixed with MMO...sob.