89' 4.0 runs rough when cold

This is probably simple, but....

Hard to start, runs really bad (like it's running on 3 cyl) until it warms up.

I was thinking ISA motor on the throttle body ?

Anyone have simuliar problems?

The wife is realyy starting to annoy me about this

The correct lead to a fix will recieve 2 free admissions into any 1 W.E.ROCK event we do this year.

Need Help, so thanks in advance

Big Rich
W.E.ROCK
530-417-5333
www.we-rock.cc

Have you checked the plugs?

tompatjr said:

Have you checked the plugs?

Click to expand...

No, because it runs great when it warms to about 170-180*

After doing seach it be one of the sensors on the Thottle body or the temp switch, any good guess's

Rich

Fuel, compression, spark...I'd check the plugs while it's been running cold and see what they tell you.

Maybe dirty injectors? Gas might not atomize well when cold.

Sound like this?

http://www.naxja.org/forum/showthread.php?t=73309&highlight=hard+hesitation

I am 99% sure this is from a bad TPS, but I still have not had time to mess with it. None of the others with these problems have given any updates.