my 89 xj will not start when it is cold but starts and runs fine once it is warm any help i can get is much needed and thanked

Thanks,
Dustin

 

please provide a lil more info.

Will it crank but not start or does it do nothing at all.

what have you done already?

 

it will crank but not start its getting fuel and the fuel pump is working i havent checked spark yet

 

The first thing i check with any XJ not starting properly is CPS. Usually you can just disconnect it then hook it back up and it will work better. Degraded connection is the most common fault with this also.

The CPS connection is located on the Drivers side of the engine. Located at the rear of the valve cover. It is a flat connection with about three prongs in it. Very easy to unplug and replug in. Let me know if this helps also may want to look into a new battery, your Cold Cranking amps on your current battery may be low.

 

ok thanks ill try that

 

As Stryker says check the CPS. Engine needs a couple things before the computer will allow it to start. First it needs 3 pulses at the correct time from that CPS. Second it needs to be at 300 RPM by the starter. and last it needs 39 pounds of fuel pressure. When all those criteria are met the computer allows spark and power to each injector so that they can spray fuel and ignite it. Besides those factors it needs unobstructed air flow.

When I had my old engine in my Jeep with bad blowby it would not start many times until I realized it was due to an oil soaked air filter acting like a choke and flooding the engine. Yank the air filter out and the little darling would start every time hot or cold.

 

thank you blue xj

 

darkness I am the Renix Guru just don't ask me a late model question. It's like making me work on a fighter jet. You will for sure be sorry, but if it is a Renix Jeep, well that I understand.

 

And I don't know Renix???

 

Not saying that but you know other stuff too. I just know the Renix stuff the best and very little other stuff. Don't get your panties in a wad Stryker. You are pretty much up on on Renix stuff too.

 

THe only think i really know is Renix. All I own are 87's lol

 

Anyone who comes on here with a rusted floor you can help with. Anyone with a Stryker problem that comes on here you can help with. Anyone who needs pointers on working on their junk one handed you can help with. None of these above conditions are limited to Renix, and you are the CF Moderator.

 

LOL

 

what do u mean by renix???

 

renix was the motor that was in jeeps from 87 to 91 i do believe it was still a 4.0 it just was the model before the hi output. so if you jeep is within those years its a renix