Please help, missing problem

Reply Subscribe

Thread Tools

Search this Thread

08-23-2009, 08:31 PM

JOHN1243

Registered User

Thread Starter

Join Date: Dec 2001

Posts: 29

Please help, missing problem

Simple, runs fine cold,,,misses like crazy warm.

LT1 6 speed, 1994

optispark replaced
O2 sensors new

OK, what on earth could this be? The first code said O2, then a mechanic said it was the optispark. these were replaced,,,,,now the next genius said to replace the computer.. we have been chasing this and wasting $$$.

HELP !!!

JOHN

08-23-2009, 08:45 PM

chevyz4life

Registered User

Join Date: Dec 2007

Location: Dumas,Texas

Posts: 66

ses light on? could be the icm.

08-23-2009, 09:17 PM

rclearyiii

Registered User

Join Date: Jul 2008

Location: Raleigh, North Carolina

Posts: 386

????

Did you change wires and plugs when to optispark was done? Chevyz is right also..in some cases a ICM can give problems when it is warmed up but not when cold.

08-23-2009, 09:39 PM

JOHN1243

Registered User

Thread Starter

Join Date: Dec 2001

Posts: 29

new wires, new plugs.

08-23-2009, 09:53 PM

rclearyiii

Registered User

Join Date: Jul 2008

Location: Raleigh, North Carolina

Posts: 386

Coolant Temp Sensor

Possibly a problem with the coolant temp sensor also..the one in the waterpump.

08-23-2009, 10:02 PM

Injuneer

Administrator

Join Date: Nov 1998

Location: Hell was full so they sent me to NJ

Posts: 70,678

Have you rescanned it for codes?

What was the specific "O2" code? Some of the O2 sensor codes are caused by problems other than the sensor itself. Knowing the exact code might provide some insight to the real problem.