Quote:
Originally Posted by jon_d4
94 ZR-1
I just removed the plenum to fix an oil leak from the crankcase vent and tubes. Got everything back together, and I'm getting a really rough idle and the car won't rev above 3k. It runs fairly smooth up to 3k, then it just pulses and shakes violently refusing to go any further.
I've already pulled the plenum back off once to check all of my vacuum lines and that I have a good connection on all of the plug wires. It's still possible that I've missed something, but I've rechecked as much as I can.
It's also throwing a code, but since it's a 94, I can't get the ECM codes by just jumping wires on the connector for the ALDL. (snip)
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Oh...but you can indeed!
For your future reference, because partial OBD2 capability was
only on 94 base cars, you can get codes from the LT5 ECM two ways.
1) Ground pin 6 of the 16-pin "OBD2" DLC connector, then key-on/engine-off and the MIL will flash codes.
2) Ground pin 12 of the 16-pin "OBD2" DLC connector, then key-on/engine off– and observe the IP Display. When the sequence gets to module 4, any codes there will be ECM codes.
You can find more detailed descriptions of these procedures in the 94 Factory Service manual. Section 6E for flash code diagnostics and Section 8D for CCM diagnostics.
Glad you got the engine running. Mixing up those plug wires does it every time, be it an LT5 or otherwise.