04 4.0 struggling to start when warm
#1
04 4.0 struggling to start when warm
So my 4.0 wj has some starting issue. When it's cold it starts just fine, but say if I was running errands and starting and stoping frequently it starts to struggle to start up, and the other day even it sounded like it was misfiring for a minute after I started it. Any ideas?
#2
CF Veteran
Join Date: Feb 2010
Location: Oroville, CA
Posts: 12,367
Likes: 0
Received 19 Likes
on
18 Posts
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
When you say it struggles to start, do mean it turns over slowly, or has an extended crank time before it starts?
#5
CF Veteran
Join Date: Feb 2010
Location: Oroville, CA
Posts: 12,367
Likes: 0
Received 19 Likes
on
18 Posts
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Start with having the battery load tested, then check the charging system, then see how many amps the starter is pulling when you're cranking the engine over.
Trending Topics
#8
Old fart with a wrench
Okay, here's something my 2000 WJ is doing and IDK if it has anything to do with your problem but I'm going to throw it into the mix anyway.
I deliver newspapers and I get to the distribution warehouse at 11:30 PM to get a good fast-loading parking spot. The truck doesn't come with the papers until about 2:00 AM, so I sit there, trying to stay warm by running the engine and heater at intervals during that time. It started this crap last winter, but now it's worse. If it's shut down long enough for the o2 sensors to cool, it runs ragged until they warm up. The engine is fully warm, but the PCM thinks it's cold and sends a rich mixture command to the injectors. As soon as they warm, it's idles fine. I'm pretty sure that's what it is because if I give it some throttle, it smooths out sooner. I've got 182K miles on the originals, so maybe I should change them, huh? I've got the CA emissions with the split downpipe and 2 small converters.
I deliver newspapers and I get to the distribution warehouse at 11:30 PM to get a good fast-loading parking spot. The truck doesn't come with the papers until about 2:00 AM, so I sit there, trying to stay warm by running the engine and heater at intervals during that time. It started this crap last winter, but now it's worse. If it's shut down long enough for the o2 sensors to cool, it runs ragged until they warm up. The engine is fully warm, but the PCM thinks it's cold and sends a rich mixture command to the injectors. As soon as they warm, it's idles fine. I'm pretty sure that's what it is because if I give it some throttle, it smooths out sooner. I've got 182K miles on the originals, so maybe I should change them, huh? I've got the CA emissions with the split downpipe and 2 small converters.
Thread
Thread Starter
Forum
Replies
Last Post
PONCHO130
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
11-19-2015 06:57 AM
xjtommy
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
11-16-2015 11:00 AM
jkurtzweil
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
0
11-13-2015 05:15 PM
Gtrsrlly
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
11
11-13-2015 08:16 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)