installed header,tb,spacer.....now it dies

Today i installed a borla header,knocked the cat out, dynomax exhaust, and a 62mm tb(stock bored out) and spacer. After finishing up i started it up and let it idle for about 5 minutes then it dies. No stumbling or misfires, just dies. I try to restart and it just cranks. Wait a couple and it re-startes fine and 5 min later dies. This continues 3-4 times more. Take for a test drive and it dies 3 times within 10 min.

any ideas? i get a map code. check for vac. leak w/ carb cleaner did not find any. ran great before hand.

help please

its a 1994 4.0 i6

hows the gasket when you put back the tb?

The symptom of a problem that surfaces after a few minutes seems tied to the fact that the computer runs a preprogrammed set of fuel air curves until operating temp is reached. It then switches to using the sensors to set the ratio. It sounds like you have a sensor problem. What year are you running? A common problem on a Renix system is to put the map sensor plug in the throttle body upside down.

What year?

Rev

just edited it a 1994 4.0 i6

Did you remove of disconnect any sensors around the cat? Why did you bypass the cat? Possably not enough restriction? The seal around the TB spacer I would also suspect.

HTH

Rev

no sensors around the cat, only 1 in exhaust is o2 sensor..... oh yeah replaced that with a brand new bosch unit....cat is orginal and did not want to mess with exhaust when it needs replaced down the road.

chance575 said:

cat is orginal and did not want to mess with exhaust when it needs replaced down the road.

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chance575 said:

knocked the cat out, dynomax exhaust

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Explain.


Rev