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'90 Legacy Poor Running


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4 replies to this topic

#1 Markus

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Posted 26 May 2004 - 11:17 PM

I re-threading my problem with my '90 Legacy. I'm running out of things to try. Any help would be appreciated.

It runs rough at idle (drive and park) and pretty much most of the time. If in park I can rev the engine above 1000 rpm and it runs fine. I have no codes at this time but have replaced the knock sensor (due to code), adjusted the TPS, checked PVC, cleaned IAC, checked injectors for operation, tested fuel pressure (all fine- pump and FPR), new plugs, wires and fuel filter. All this seems to work ok.

I am now looking at the ignition coil. I have a Hitachi (noted little logo on front) and the resistance in the connector from terminal 1 to 2 & 2 to 3 is 0.9 & 0.8 ohms (manual says 0.7 ohms with no tolerance?) and (plug wire terminals) 1 to 2 & 3 to 4 of 15.5K and 15.6K (manual says 13.8k with no tolerance?). Does anyone know if this measurement is too far from ideal? Also, I noticed that the "paint" on the bottom of the coil was falling off. I pulled it all and put electrical tape on it - but that didn't help rough running.

Running in the dark and looking for sparks showed nothing.

I REALLY don't want to give in but I am near the end of the rope. Any input would be great.

#2 Setright

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Posted 27 May 2004 - 01:11 AM

Where's the old thread, I need to ask some questions that are probably already answered there.

#3 P K

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Posted 27 May 2004 - 01:02 PM

Check for the famous loose crank pulley/timimg belt gear slipping in key slot on crankshaft. r/PK

#4 Markus

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Posted 27 May 2004 - 01:16 PM

Setright:

These are the 2 threads related to my delema.

90 Legacy loping idle - HELP!
Posted Image Fuel Pressure Regulator

#5 Markus

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Posted 27 May 2004 - 11:00 PM

I just tried the timing light trick as I've read on other threads. Cylinders 1 & 3 trigger the timing light at twice the rate of cylinders 2 & 4. Is this the wasted spark thing I've read of or signs of a bad coil?

OZified: The crank pully actually slips on the key way? If this was messing with my timing wouldn't it run badly always? I can get it to run smooth in park above 1100 rpm.

Also, while the engine warms up it runs pretty smoothly without a load. Probably cause it is above 1100 rpm during warm up. As soon as its warm it runs like crap.




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