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General Forums => The Mess Hall => Topic started by: JeepAustinWeird on September 05, 2010, 10:56:46 AM

Title: 1990 TBI idles til warm then dies
Post by: JeepAustinWeird on September 05, 2010, 10:56:46 AM

I've changed fuel pump, filter, MAP sensor, air filter, cleaned the plugs and distributor cap, no change.  Noticed that the tach goes crazy if pushed above idle-- also misses and knocks really bad above idle.  After she warms up, she gives up the ghost. What's going on?

Title: Re: 1990 TBI idles til warm then dies
Post by: sharpxmen on September 05, 2010, 11:11:07 AM

Quote from: JeepAustinWeird on September 05, 2010, 10:56:46 AM

I've changed fuel pump, filter, MAP sensor, air filter, cleaned the plugs and distributor cap, no change.  Noticed that the tach goes crazy if pushed above idle-- also misses and knocks really bad above idle.  After she warms up, she gives up the ghost. What's going on?

sounds like a crankshaft position sensor or CPS but can't tell for sure.

Title: Re: 1990 TBI idles til warm then dies
Post by: dustjunkie on September 05, 2010, 12:37:35 PM

When it's running does it pop or just stumble?

I'm with sharp, it's gotta be in the ignition circuit, most likely cps.  Jeep coils are notoriously bad and can give the same symptoms but wouldn't affect the tach.

Title: Re: 1990 TBI idles til warm then dies
Post by: aka-justin on September 06, 2010, 08:55:31 PM

I agree, sounds like a CPS sensor.