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TexasZR1 · 03-23-2019

A couple other common things to check:

These motors can tend to have a random backfire during start (probably related to fhe old multecs; not sure if cars with update injectors still do this?).
This backfire tends to blow off the pcv grommet AND the MAP sensor vacuum line at the back of the motor. Check to make sure these are both connected. MAP will trhow a code, but pcv may not.

03-23-2019	#10
TexasZR1 Join Date: Oct 2018 Location: Houston Texas Posts: 48	Re: Extremely High Idle A couple other common things to check: These motors can tend to have a random backfire during start (probably related to fhe old multecs; not sure if cars with update injectors still do this?). This backfire tends to blow off the pcv grommet AND the MAP sensor vacuum line at the back of the motor. Check to make sure these are both connected. MAP will trhow a code, but pcv may not. __________________ 1990 ZR1 #2184 BLK/BLK. Essentially stock. Plug-in Skip Shift Eliminator.