chilixj99

I've been having problems with my XJ running rough at low RPM's when the engine is cold. By running rough I mean that it hesitates really bad like it is losing power. I have to feather the accelerator to keep it going. It clears up in a couple of min's and runs fine. I've changed the IAC, TPS, and MAP sensors. Last year, I changed the CPS and O2's. What the would cause this? Please help me Thanks guys.

nick_n_ii

Have you cleaned the injectors?

Have you change brands of fuel you buy?

chilixj99

have not cleaned the injectors or changed the type of fuel. I would think that if it's an injector problem then I would had issues all the time, not just when the engine is cold.

chilixj99

Bump. And another question. Does my 99 XJ have an EGR Valve??

chilixj99

Nevermind. Just learned that the last year the XJ had an EGR Valve was 1990.

chilixj99

bump

89Laredo

CHECK YOUR MAT!
The manifold air temp sensor will tell the computer its -42* out if it is bad, this will cause an extremely rich condition...
Scroll down to "manifold air temperature sensor" This is for Renix engines, but AFAIK the sensor is the same..
http://www.lunghd.com/Tech_Articles/...iagnostics.htm
Itll be something like this:
http://www.summitracing.com/parts/CC...4/?image=large
Just a note: that isnt the one for your jeep, I couldnt find it. So dont go buying this one thinking itll work on your jeep! lol

chilixj99

I can't find a MAT sensor for my XJ anywhere