CRD has idle problem when first starting, sometimes dies.

JEBCRD · **Posted:** Tue Jul 19, 2016 1:52 pm

Need some help and suggestions as what might be causing this problem. My crd has started acting up when starting it after it's set overnight or a few hours like in town shopping. It will start fine then in a little bit while sitting and letting it warm a little or just run a min or tow before putting in gear it will start to quit then pick its self back up it might do this several times then sometimes die and sometimes not. Watching the rpm gauge it will be normal then drop down then pick back up, really erratic. It has been somewhat random but now its starting to be the norm, like every time i start it. I have changed the fuel head, added the in tank pump and have changed the crank sensor. I've run the ORM mod ever since getting it at the 50,000 mile mark, it now has 80,000 on the clock. The only thing is I used the quick connects when putting the in tank pump in. They look good to me so i kept them as is. Now this morning expecting it to act up i checked under the hood at the pump and it was rock solid, thinking i might be leaking down over time with it just sitting. Now it will start right back if it dies and most time line right out and run fine down the road. Its just acting weird on start up. The only thing i can come up with is air in the fuel causing it to stumble while idling but can't figure how with the mod of the in tank pump. My next move is to eliminate the quick connects and see if that does it but I wanted to see if anyone else in the community has had a similar situation with their CRD and what the fix was. I want to avoid wild goose chases if you know what i mean. It's getting so frequent that no one wants to drive it thinking it will quit on them, they are a little gun shy of it. Thanks in advance for any input.

WWDiesel · **Posted:** Tue Jul 19, 2016 2:01 pm

Is it setting any DTC codes? Have you scanned it for any stored DTC codes? First place to start.
With in-tank pump it is not air in fuel unless pump is not running for some reason. A simple in-line gauge will diagnose this.
My best guess would be it could be possibly a cam sensor?
Need the codes to tell for sure!!! :wink:

JEBCRD · **Posted:** Tue Jul 19, 2016 3:50 pm

I hadn't thought about a code. That i'll check this evening and report. I know when i was having trouble with it dying after driving it a few miles It didn't give a code and it wound up being the crank sensor wigging out when it got to a certain temp. I'm having a problem convincing myself it's an air in fuel too since doing the pump in tank. It lacks a couple of months being a year since doing it. A gauge would be handy for the fuel but if the pump handle is firm i figure it's primed and ready.

Will a problem with the cam sensor give a code or is it like the no code giving crank sensor.

flash7210 · **Posted:** Tue Jul 19, 2016 5:45 pm

This could be the familiar transmission drain back problem. The solution for that is to let the engine idle in neutral for a minute before putting it in gear.

If not that, then it could be a dying sensor or a bad electrical connection.

JEBCRD · **Posted:** Tue Jul 26, 2016 11:39 pm

Still haven't found out what could be causing my weird idle and it's even pulseing while driving down the road. It's not constant. Sometimes it will run just fine idle and smooth down the road. It's randomness when it acts up. I can't seem to think it's a fuel delivery problem at least up to the filter head beyond that I'm not sure. Could electrical voltage drop cause such a problem? Battery replaced in spring,alternator maybe, decoupler? Sure wished these rigs had voltage read outs. It sure is a love hate struggle with these rigs. Oh! No codes given either.
Also, I'm getting lots of black smoke when this surging starts sitting at idle.

JEBCRD · **Posted:** Fri Aug 05, 2016 10:05 pm

Well still trying to figure what's going on with this jeep. I ran the codes and nothing. It acts just like a gasser with a bad plug. It misses and stumbles and when it starts this I get visible smoke and it seems to lag a little while accelerateing then pick up and takes off. It might miss and stumble for a bit then run smooth and idle just fine. it can do this all day sometime while driving around town the other days never give me a problem. I'm planning on changing the cam sensor this weekend and cleaning the map. Hopefully one of those will fix it. I'll prolly actually do one and drive some then do the other that way I'll know which one was the culprit if the problem goes away.

undrgnd · **Joined:** Sat Mar 26, 2016 4:47 am **Posts:** 194

Subscribe...interested to know what's causing this.

JEBCRD · **Posted:** Sun Aug 14, 2016 8:56 pm

Update: I changed the cam sensor and cleaned the map too at same time. My map was really surprisingly clean at 80,000 miles as compaired to when I cleaned it at 50,000 right after purchase. I've been running the Maf unplugged since getting it and can tell it has made a big difference. I did note that it was wet with oil, I hope that is normal. The first time cleaning it it looked like the one in SAMs newbie guide pics. I did an oil and filter change and was hopeful I may have solved my problem.

I started vehicle, it started and idled perfect with no miss or sputter or dying. I retired for supper then thought I would try again after a couple of hours sitting. It started and after about a minute it started the missing and stumbling thing. I reved the engine up and down and it would miss and puff a little more than normal black smoke out the exhaust. It finally seemed to smooth out so I shut it down still scratching my head. It has set most of this week until Friday and I took a short drive with it. It started fine run down the road great made a couple of stops and one one of the stops while starting to park it kind of give me a slight miss and stumble. Drove back home run fine. Put about 150 miles on it Friday. Sat took another drive and it started fine idled fine started down the drive, which is rather long about 1000ft, stopped to pull out and bam! It stumbled and farted a few times which gave me pause to pull out to cross traffic. It did it first when i started to gas it to pull out ,it hesitated and coughed, which give me pause to make sure it would go. I sit reveing the engine until it seemed to smooth out. Drove it about 90 miles with just an occasional stop for turns, mostly four lane and at 70 run fine, even my fuel average went up. Pulled into my destination put in park and was sitting letting idle for a few minutes like I always do to allow cool down of turbo and it give a slight miss not a bad one but let me know I still had an issue.

I don't know I've search a lot of threads and have read a ton but not sure what assume next other than could it be an injector and how would I figure out which one to suspect. It wouldn't bother me so much if it was me driving it all the time but my daughter has taken it back to school with her and in her words" it makes me nervous driving it" it stranded her once when the crank sensor went bad, so she's a little gun shy.
Any ideas? all suggestions would be appreciated.

flash7210 · **Posted:** Sun Aug 14, 2016 9:21 pm

Do you have a way of reading fuel rail pressure?
It seems like a fuel system problem.
Could be air in fuel.

JEBCRD · **Posted:** Sun Aug 14, 2016 11:43 pm

Flash, no I don't have a way of checking rail press. You think I may have a pressure sensor going bad on the rail? Where is it located ? Back of the rail toward firewall?

I have noticed that my idle sound is different than it used to be, it use to just purr and sound very tight now it's like a rougher purr it's hard to describe but it isn't as smooth of idle as it was a coupl month ago.

I've been wondering if it may be a voltage dip causing my ECM to wig a little. From what I've been reading I'm about the mileage for the alternator coupling thing to fail. Could this be a possibility? Voltage dipping. How low of voltage would cause a problem for the ECM.

mass-hole · **Posted:** Sun Aug 14, 2016 11:57 pm

JEBCRD wrote:

Flash, no I don't have a way of checking rail press. You think I may have a pressure sensor going bad on the rail? Where is it located ? Back of the rail toward firewall?

I have noticed that my idle sound is different than it used to be, it use to just purr and sound very tight now it's like a rougher purr it's hard to describe but it isn't as smooth of idle as it was a coupl month ago.

I've been wondering if it may be a voltage dip causing my ECM to wig a little. From what I've been reading I'm about the mileage for the alternator coupling thing to fail. Could this be a possibility? Voltage dipping. How low of voltage would cause a problem for the ECM.

The sensor is in the middle of the rail. The one on the end is the solenoid which helps control the pressure.

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CRD has idle problem when first starting, sometimes dies.

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