Hard Cold Weather Starts

[StompJrKz400]

my 94 yj 2.5fi is starting hard, temps at night have been 30ish

what should i check first

[92xjlaredo]

did you ever put plugs in that or no?

[StompJrKz400]

Yes

[StompJrKz400]

bumping this post, it had nothing to do with temp, the jeep cranks fine ( new starter ) but takes about 1 minute of cranking to finally start, the check engine light comes on right as it begins to start, then shuts off, after it starts the jeep burbles for a few seconds, then runs PERFECT

im going to do normal ignition stuff today, cap and rotor, check wires, and check some vacuum stuff

[ct67_72]

Do you have access to a scanner with live data?
If so check to see what the ecm is reading for coolant temp before you try and start it

[StompJrKz400]

its a 94

but yeah i had an obd2 key that hooks to my laptop to show live data

i just did the cap and rotor, no change, also, spraying starter fluid down the intake yields no results

im going to test the coil now, see if it shot

[ct67_72]

hmmmm, you need a spark tester. So you can see what its doing while its cranking, maybe the spark is weak, wouldnt make sense that just all of a sudden it gets spark and starts though.

[StompJrKz400]

yup, im waiting for my finace to get back so i have someone to turn the key, once shes here ill test spark and report back,

i have the coil off, i was thinking of trying a different coil, i think i have a few accel and msd coils kicking around

[crosbike]

IAC cleanse?

[StompJrKz400]

ill go check/clean it while im out there,

[StompJrKz400]

Ok, pulled tb , cleaned iac, also cleaned whatever sensor is in the intake manifold, unplugged computer, sprayed wd40 on connector, bolted back in

Now the jeep starts great, but i will see how it starts in morning

[StompJrKz400]

Nvm, went out and started it cold, took 1 minute of cranking to finally begin firing

[Pete]

found this
Well I think I finally found the problem but still haven't gotten around to fixing it yet. The jeep is my DD in the winter when it's crappy out and I couldn't take the chance of not having it for a couple of days. What I found was my fuel pressure at the rail is at about 80psi when running. It should only be 35ish. I changed the regulator and that didn't do anything. Basically what is going on when I first try to start the jeep the cylinders get flooded with massive amounts of fuel and has a hard time firing. What I've got is a pinched return line somewhere right around where the lines enter the tank. The skid plate looks kinda rusty so I wasn't sure how many days it would take for me to drop the tank and everything to inspect. So I should hopefully be getting to it soon since spring offically started yesterday. I will keep you posted on my findings!

check all the fuel lines

[Pete]

for the hell of it use a hair dryer to warm up your ECU next time its cold. I have seen that problem before.

[StompJrKz400]

for the hell of it use a hair dryer to warm up your ECU next time its cold. I have seen that problem before.

This is it i believe , found out caps go bad imon ecm, 5 dollars at RadioShack to fix it, The jeep wont start until the CE comes on, then it fires perfect