loosing spark at 2500 rpm

1068 Views 9 Replies 3 Participants Last post by boostpowered, Aug 13, 2010

boostpowered

Discussion Starter · Aug 13, 2010 (Edited)

new issue just started on my 89 9000 cd when driving if i go past 2500 rpm it sounds and feels as if i have a rev limiter set, but i don't. it isn't fuel cut and no limp home mode i still have power/boost until 2500 rpm. any idea what may be causing the problem before i go rip the ignition wiring apart chasing electical faults. my A/f ratio is stoichometric if that helps so no lean/rich conditions. i forgot to mention i have been having trouble getting her to start after sitting for a week also the batt has 14.47 volts, i know the starter and alternator both work which i leading me to beleive it is the igniton unit located on the wheel well next to the battery.

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BurnsSide42

· #2 · Aug 13, 2010

Confirmed spark loss? Sure it's not starving for fuel? Possible weak fuel pump not able to supply enough fuel, or bad FPR.

If certain it's a spark problem - start with a new DI (or spare) and see if that clears it up - plugs are OEM correct and gapped proper yes? Still no spark - check wiring for DI and backtrack from there. I'm not 100% on the 89 CD 9000's - it's NOT a TCS issue as they don't have TCS (no limp home to enter). If it's a 2.0L with Distributor - check there. Could be a bad connector on the distributor or even a worn cap/rotor combo. Wires could be arching... and so on. A few things to check - so report back with findings

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boostpowered

Discussion Starter · #3 · Aug 13, 2010

its not fuel i have 2 pn555 pumps from msd 1 in tank and 1 out both less than 2 years old the fpr was purchased at the same time it is a 3.0bar. my car is not a di car i have the cap/rotor and lh jetronic. cap and rotor a 1 month old plugs are 1 week old and gapped properly. wires are fairly new. i went to auto parts store yesterday to have batt checked due to not wanting to start intermidently they tried blowing smoke up my ass by telling me my starter is bad. wich is false because it wouldnt have started to get it there. just pulled the line off the fpr and turned on ignition and got a nice spray of gas on my wall so that definatly is working.

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mike d

· #4 · Aug 13, 2010 (Edited)

ignition amp, mine did this about 2 hours before it crapped out completely. there a bitch to diagnose, it much easier to just have a know good one to test with. once diagnose they take 2 mins to change.

the amp is located on the drivers side of the motor bay, atop the fender well/strut tower

good luck
mike

this ignition system is identical to whats on a c900 turbo, so check out those BBs for feedback, most 9k people here have DI cars

here is the part
http://www.eeuroparts.com/Main/PartDetail.aspx?id=9390220

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boostpowered

Discussion Starter · #5 · Aug 13, 2010

thanks mike i was thinking it would be the ignition amp, that would be the best case scenario. its just weird that it feels like a rev limiter is activated and loosing spark on all cylinders in successive order

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BurnsSide42

· #6 · Aug 13, 2010

If you need one I have a bunch of those Ignition amps from back when I had my 87' 9000 (never had one fail - kept 4 int he car just in case) lol I can drop one in the mail if you'd like. Depending where you live we can work out a few beer trade or something.

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mike d

· #7 · Aug 13, 2010

boostpowered said:
thanks mike i was thinking it would be the ignition amp, that would be the best case scenario. its just weird that it feels like a rev limiter is activated and loosing spark on all cylinders in successive order

thats a dead ringer for a failed ignition amp, my 88SPG did this too me it was F-ed up, it started at like 5000rpm limets, then slowly worked its way down to 1900rpm as a limet before crapping out completely

mike

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boostpowered

Discussion Starter · #8 · Aug 13, 2010

thanks everyone for the info. you have justified my Suspicions. burnside 42 i live in indianapolis, the only things i could trade that i have lying around are a t3 with bad bearings and a smic out of a 900. probably wouldn't be worth the shipping though

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BurnsSide42

· #9 · Aug 13, 2010

If you are interested in mine - call it $6 shipped and I'll drop it in the mail Monday AM

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boostpowered

Discussion Starter · #10 · Aug 13, 2010

thanks for the offer i really appreciate it. but i just grabbed 3 from my local scrap yard i was in luck they were all the 227 100 139.

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