|
|
Post by CumminsJeep on Jan 15, 2009 21:46:45 GMT -5
my friends yj has been having trouble starting......it runs fine once started. but it takes like 3 minutes of cranking to get it to turn over. im kinda stumped. im thinkin its something with the ignition system but that would mean it wouldnt run right once started i would think. so i dunno. if you have any answers let me know
|
|
crosbike
 
Swap Shop Cop
choo choo
Posts: 6,389
|
Post by crosbike on Jan 15, 2009 21:52:43 GMT -5
wut year? engine?
|
|
|
|
Post by Dr. Thunder on Jan 15, 2009 21:54:12 GMT -5
3 mins of straight cranking would kill a battery. 1 minute would probably kill a battery. How long for sure? Check what the fuel pressure is doing?
|
|
|
|
Post by CumminsJeep on Jan 15, 2009 22:02:34 GMT -5
seriously it was prob at least a minute of cranking prob more. i think its a 94 and it has a 4.0
|
|
|
|
Post by CumminsJeep on Jan 15, 2009 22:03:57 GMT -5
and corey i was thinkin low fuel pressure.....bad pump? bad fuel filter? she said it only does it when its cold..
|
|
CSaddict
PayPal hater
I love Newbs.
Posts: 3,889
|
Post by CSaddict on Jan 15, 2009 22:04:33 GMT -5
Fuel, spark or compression. Pick one. I would go with fuel. Like Corey stated. Check the fuel pressure. 94 4.0 should be 39 at the rail if memory serves.
|
|
|
|
Post by CumminsJeep on Jan 15, 2009 22:07:39 GMT -5
alright that was my next guess cause i know it has compression cause it runs fine, and there has to be spark for it to run....ill check fuel pressure. gotta get a gauge........would it be a bad pump? start with a fuel filter? what would explain it only doing it when its cold
|
|
crosbike
Swap Shop Cop
choo choo
Posts: 6,389
|
Post by crosbike on Jan 15, 2009 22:13:36 GMT -5
iac perhaps? does he step on the gas when he tries to start it?
next time he starts it have him give it a little throttle and see if it starts.
|
|
|
|
Post by Dr. Thunder on Jan 15, 2009 22:15:24 GMT -5
iac perhaps? does he step on the gas when he tries to start it? next time he starts it have him give it a little throttle and see if it starts. Giving a fuel injected vehicle throttle during start up cuts the fuel off completely. |
|
crosbike
Swap Shop Cop
choo choo
Posts: 6,389
|
Post by crosbike on Jan 15, 2009 22:22:41 GMT -5
iac perhaps? does he step on the gas when he tries to start it? next time he starts it have him give it a little throttle and see if it starts. Giving a fuel injected vehicle throttle during start up cuts the fuel off completely. full throttle. not part throttle  |
|
|
|
Post by Dr. Thunder on Jan 15, 2009 22:25:09 GMT -5
Giving a fuel injected vehicle throttle during start up cuts the fuel off completely. full throttle. not part throttle Hmmm. Ok I'll buy it cause I've never tried part throttle. I am going to hold you to it though. |
|
crosbike
Swap Shop Cop
choo choo
Posts: 6,389
|
Post by crosbike on Jan 15, 2009 22:27:08 GMT -5
I know what you speak of and trust me part throttle works. Full throttle or Wide open throttle (WOT) sends a signal to the injectors to not open i believe
|
|
|
|
Post by CumminsJeep on Jan 16, 2009 0:31:25 GMT -5
i know it does that on some of the newer diesel like the ford 6.0, i didnt know it did that for gas motors too. and yea we were tapping the throttle and puttin it to the floor half throttle, everything haha.
would low fuel pressure make it not run right once its started?
|
|
|
|
Post by Jeep Creep on Jan 16, 2009 0:42:09 GMT -5
sounds similar to my issue, id like to kno as well. im pretty sure my pump is on the way out tho
|
|
|
|
Post by Dr. Thunder on Jan 16, 2009 9:14:19 GMT -5
i know it does that on some of the newer diesel like the ford 6.0, i didnt know it did that for gas motors too. and yea we were tapping the throttle and puttin it to the floor half throttle, everything haha. would low fuel pressure make it not run right once its started? If it was low enough absolutely. Fuel injection relies on the pump making pressure. |
|
to every one of my posts.
