"Nobi" (nobi)
07/22/2015 at 21:31 • Filed to: None
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"Nobi" (nobi)
07/22/2015 at 21:31 • Filed to: None | 0
| 19 |
Having problems getting our 2000 Jeep Grand Cherokee Laredo 4.0 to run. It ran perfectly fine for the longest time. Sat for a week and a half, and now whenever you try to start it, nothing. You have to floor it to get it to run, and even then it won’t idle, it sputters horribly and reeks of gasoline. Is there anything these Jeeps are known for that would cause this? Already tried the camshaft and crankshaft position sensors with no difference. Obviously the spark plugs are soaked in gasoline now, so it’s hard to tell what their real condition is. I might still change them.
E92M3
> Nobi
07/22/2015 at 22:13 |
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Ignition Coil would be my guess.
DogonCrook
> Nobi
07/22/2015 at 23:28 |
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Does this have that spider injection system like they used in gm trucks? Looks like a damn octopus. When those start leaking, all your cylinders will flood.
Boss2452stolemylunchmoney
> Nobi
07/23/2015 at 00:13 |
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Excessive fuel could be related to faulty pressure regulator or stuck injectors too.
TheD0k_2many toys 2little time
> Nobi
07/23/2015 at 00:31 |
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sounds like an injector. my old 4.0 I had to keep pedal floored to get it to start it went into flood mode and didn’t pump much fuel in. I had a stuck injector (common issue I think) so it would flood the engine when the pump turned on sometimes when I would not drive it all the time
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Nobi
> DogonCrook
07/23/2015 at 06:26 |
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No, individual injectors like how GM did on everything else.
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Nobi
> Boss2452stolemylunchmoney
07/23/2015 at 06:26 |
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Are those common on the 4.0?
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Nobi
> TheD0k_2many toys 2little time
07/23/2015 at 06:29 |
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If it has a stuck injector, that would make it not run? I mean misfire, sure, but no idle and overpowering gas smell?
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Boss2452stolemylunchmoney
> Nobi
07/23/2015 at 06:40 |
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Not sure. Just throwing out possibilities. When you floor it, to get it to run, do you release the throttle after it fires up?
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Nobi
> Boss2452stolemylunchmoney
07/23/2015 at 08:06 |
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If I do, it dies.
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Boss2452stolemylunchmoney
> Nobi
07/23/2015 at 09:25 |
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So, when you flood a car, you have to give it lots of air to work the excess fuel out of the cylinders. Might try giving it the beans until the engine starts to even out. Otherwise, I would check all of your plugs to see if they’re wet. If all of them are wet, it may be something like a fuel pressure regulator sending too much pressure to the injectors, causing them to hold open. If less than 6 are wet, than it may be fuel injectors stuck open. If you don’t have any codes, I would start with these steps.
Another theory could be that your coil packs are dying. They have enough juice to get the engine to start, but can’t keep it running under heavier charge densities.
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Boss2452stolemylunchmoney
> Nobi
07/23/2015 at 09:26 |
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I’ve seen fuel injectors stick before and flood the engine and keep it from running. It can happen. Had to find new fuel injectors at SAE Formula Challenge one year because the engine quit working right before noise testing.
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Nobi
> Boss2452stolemylunchmoney
07/23/2015 at 09:46 |
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Holding it to the floor gets it to run, poorly. It won’t clear out, misfires like crazy, dumps fuel down the exhaust, and stalls as soon as I let off the throttle. I’ll have to try again after work today and see what the spark plugs look like now that I’ve let them sit and dry out.
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TheD0k_2many toys 2little time
> Nobi
07/23/2015 at 11:08 |
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possible yes. cause if there is way too much fuel in the engine it cant fire with it
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Nobi
> TheD0k_2many toys 2little time
07/23/2015 at 11:21 |
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Would it make sense for several to go at once though? I’d think if it was just one it would still idle, albeit poorly.
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TheD0k_2many toys 2little time
> Nobi
07/23/2015 at 11:27 |
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possibly if the fuel filter failed or something. but to me it sounds like the issue if fuel related. so not saying for sure it is an injector but thats where i would start the investigating
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Nobi
> TheD0k_2many toys 2little time
07/23/2015 at 11:29 |
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Hmm, maybe. That’s one thing I haven’t changed yet since we bought it.
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TheD0k_2many toys 2little time
> Nobi
07/23/2015 at 11:36 |
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id pull them and check/ replace them. also check forums as there are many you can swap in for a little more mpg and umphhh
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Nobi
> TheD0k_2many toys 2little time
07/23/2015 at 12:16 |
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That’s one complaint I have about it. I know it’s no Prius, but I’d expect better MPG than 18 highway.
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DogonCrook
> Nobi
07/23/2015 at 15:20 |
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I’d still do a fuel pressure test because it’s quick and easy. If it’s the right pressure, and it holds after you kill it, you can move on to other areas. That doesn’t mean your injectors couldn’t have issues but that they couldn’t cause this. Alternatively pull them all but leave them connected and see if they spray when you power on without cranking. That won’t tell you if they are overpressured though.