Ran rough, shut off, making loud noise and will not start

Tiny
DUCKSHOOTER
  • MEMBER
  • 2000 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
I have the vehicle listed above Laredo 4.0l WJ. The thing was running fine one day and the next day was bad news. Tried starting it it turned over but it wasn’t normal like it had no compression or spark or something. It did start and the engine was shaking so hard thought it was going to break in half then it smoothed out a little bit was still running rough. Then it was making a loud noise seems like it's coming from oil pan. Shut it off and it will not start. Any ideas were to start? Anything will help. I’m not a mechanic but I do tinker.
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Thursday, October 8th, 2020 AT 7:05 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Can you describe the noise you heard? Was it a knocking sound? Also, can you record the engine cranking so I can hear it?

If it isn't starting, it can be several different things. Here is a link that explains the most common causes or a crank no start. Take a look through it and see if it helps. However, the noise you heard has me a bit concerned.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Let me know if that helps and if you could record it cranking.

Take care,
Joe
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Thursday, October 8th, 2020 AT 7:11 PM
Tiny
KASEKENNY1
  • EXPERT
Two things. First, can you get a quick video of what it sounds like cranking?

Then we need to drain the oil and inspect for metal. If you find metal then we may have larger engine issues.

If there is no metal then the engine is just missing very badly which is why it is making noise and not running well.

However, I am concerned with this progression that we have a larger engine issue.

https://www.2carpros.com/articles/car-cranks-but-wont-start

If there is no metal, then fill it with the proper amount of oil and run through the guide above. We need fuel, spark and compression to start the engine.

If it sounds like you have no compression then we need to check it.

https://www.2carpros.com/articles/how-to-test-engine-compression

If that checks out, then use starter fluid in the intake and see if it starts. If not, we need to check for spark.

Let's start here and go from there. Thanks
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Thursday, October 8th, 2020 AT 7:17 PM
Tiny
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  • MEMBER
The noise sounds like a piston slap it s pretty loud and I crawled under it sounds like it s coming from the oil pan. I actually took the oil pan off and tried checking the bearings. With a little frustration while I was under I noticed the timing chain was really loose like inch and a half play in it. Thinking that might have something to do with it anyway I think I kind of jump the gun with pulling the pan now can t even try to start it to diagnose it. By the way link has good information. I think I m looking for an easy fix but I just don t see that happening and it has a new fuel pump that I put in two weeks ago. Think I m going to put oil pan back on some fresh oil and try it again. Any more input would be great.
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Thursday, October 8th, 2020 AT 7:41 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
It sounds like the timing chain needs replaced. I would remove the timing chain cover and inspect.

Here are directions for replacing it:

__________________________

2000 Jeep Truck Grand Cherokee 2WD L6-4.0L VIN S
Timing Chain
Vehicle Engine, Cooling and Exhaust Engine Timing Components Timing Chain Service and Repair Procedures Timing Chain
TIMING CHAIN
REMOVAL
1. Disconnect negative cable from battery.
2. Remove the fan and shroud.
3. Remove the serpentine drive belt.
4. Remove the crankshaft vibration damper.
5. Remove the timing case cover.

Pic 1

Fig. 58

6. Rotate crankshaft until the "0" timing mark is closest to and on the center line with camshaft sprocket timing mark (Fig. 58).
7. Remove the oil slinger from the crankshaft.

Pic 2

Fig. 59

8. Remove the camshaft sprocket bolt and washer (Fig. 59).
9. Remove the crankshaft sprocket, camshaft sprocket and timing chain as an assembly.
10. Installation of the timing chain with the timing marks on the crankshaft and camshaft sprockets properly aligned ensures correct valve timing. A worn or stretched timing chain will adversely affect valve timing. If the timing chain deflects more than 12.7 mm (1/2 inch) replace it.

INSTALLATION
Assemble the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks aligned (Fig. 58).
1. Apply Mopar Silicone Rubber Adhesive Sealant to the keyway in the crankshaft and insert the key. With the key in the keyway on the crankshaft, install the assembly on the crankshaft and camshaft.
2. Install the camshaft sprocket bolt and washer (Fig. 59). Tighten the bolt to 68 Nm (50 ft. Lbs.) Torque.
3. To verify correct installation of the timing chain, rotate the crankshaft 2 revolutions. The camshaft and crankshaft sprocket timing mark should align (Fig. 58).
4. Install the crankshaft oil slinger.
5. Replace the oil seal in the timing case cover.
6. Install the timing case cover and gasket.
7. With the key installed in the crankshaft keyway, install the vibration damper, washer and bolt. Lubricate and tighten the bolt to 108 Nm (80 ft. Lbs.) Torque.
8. Install the serpentine drive belt.
9. Install the fan and hub assembly. Install the shroud.
10. Connect negative cable to battery.

__________________________

Let me know what you find or if you have other questions.

Take care,
Joe
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Friday, October 9th, 2020 AT 9:11 PM
Tiny
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  • MEMBER
Hey guys, thanks for your input very helpful. I put pan back on filled with fresh oil and it started it ran terrible had no throttle response shut it off. Now it won t start again. Sounds like it has no compression and it s probably got a quart of fuel in the oil is that fuel injectors.
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Sunday, October 25th, 2020 AT 2:28 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Did you replace the timing chain? Also, can you record the engine cranking so we can hear it?

Joe
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Sunday, October 25th, 2020 AT 7:06 PM
Tiny
DUCKSHOOTER
  • MEMBER
I haven t really done anything to it. But I think I m going to replace the crank sensor, cam sensor, timing chain, spark plugs, fuel injectors and the coil rail if that doesn t do it I m going to push it off a cliff.
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Monday, October 26th, 2020 AT 10:46 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I would see if the chain gets it running first before putting too much into it. However, I don't think I would push it off a cliff. LOL

Is it possible for you to record it cranking and upload it for me to hear?

Let me know. Also, let me know if you need help with anything.

Joe
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Monday, October 26th, 2020 AT 6:40 PM
Tiny
DUCKSHOOTER
  • MEMBER
I m just wondering with the amount of gas that is pouring through it could it catch a spark and blow up that probably sounds like a dumb question, but what do you think? I will try to record it if you think it will be okay. Thanks for showing an interest in my problem.
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Monday, October 26th, 2020 AT 8:32 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
No, that isn't a dumb question. Anything is possible.

If you are worried about ignition spark from the plugs, simply disconnect the ignition coil rail and isolate the connector. (See pic 1)

Not being there, I'm not sure how much fuel you are referring to. But if it is spark from the plugs that is the concern, disconnecting the coils will stop that from happening.

Let me know.

Joe
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Tuesday, October 27th, 2020 AT 2:47 PM
Tiny
DUCKSHOOTER
  • MEMBER
Ya, that makes sense. Don t know what I was thinking but I m going to try it and see if I can record it for you. Appreciate your time I will definitely get back to you in a day or so.
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Tuesday, October 27th, 2020 AT 6:19 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Happy to help. Let me know what you find. I'm interested in hearing it crank.

Take care,
Joe
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Tuesday, October 27th, 2020 AT 6:34 PM

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