94 grand Cherokee 5.2 bogging
04-21-2018, 11:03 PM
#1
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Year: 1994
Model: Grand Cherokee(ZJ)
Engine: 5.2
94 grand Cherokee 5.2 bogging
I have bought a 94 grand Cherokee 5.2l and it has new fuel filter new tps new map sensor and looks to be new distributor but it still idles rough and the fuel pressure is 30 psi at idle and 40 when I give it gas. I need help trying to figure it out so I can drive it cause she's going nowhere fast. If anyone can help me out that would be great cause I'm out of ideas
04-22-2018, 06:32 AM
#2
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Welcome to the forum.
How do the plugs look? Do the plug wires measure okay? How does the rotor, cap and coil look?
The TSB 18-48-98 for the spark plug wire routing should be implemented.
Do the cylinder compression numbers look okay?
When required, use the TSB for intake plenum torque. My suggestion is to use new Fel-Pro bolts and follow the TSB.
How do the plugs look? Do the plug wires measure okay? How does the rotor, cap and coil look?
The TSB 18-48-98 for the spark plug wire routing should be implemented.
Do the cylinder compression numbers look okay?
When required, use the TSB for intake plenum torque. My suggestion is to use new Fel-Pro bolts and follow the TSB.
04-22-2018, 01:41 PM
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Year: 1994
Model: Grand Cherokee(ZJ)
Engine: 5.2
I took the rotor of and it was burnt so I just changed it and still acting the same. I noticed that the plugs on top of the distributor was shooting sparks at the heater core hose? Any ideas
04-22-2018, 06:42 PM
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Year: 1994
Model: Grand Cherokee(ZJ)
Engine: 5.2
ok new update. I changed the rotor and cap and got new plugs and wires she runs a little better but still bogging. Any ideas? I may try to get the cam shaft position sensor changed if I can find it.
04-22-2018, 08:40 PM
#6
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The crankshaft position sensor is conveniently located in the most difficult to reach location.
Use an OEM replacement.
Use an OEM replacement.
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04-22-2018, 08:47 PM
#8
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What does: "the plugs on top of the distributor was shooting sparks at the heater core hose" mean?
The Mopar Combustion Chamber Cleaner can provide beneficial results.
Has the cylinder compression been properly measured?
How many miles on the timing chain? Note that the Miller 6635 tool is required for proper replacement.
How does the plenum pan look? Maybe the common plenum pan gasket failure needs replacement.
The Mopar Combustion Chamber Cleaner can provide beneficial results.
Has the cylinder compression been properly measured?
How many miles on the timing chain? Note that the Miller 6635 tool is required for proper replacement.
How does the plenum pan look? Maybe the common plenum pan gasket failure needs replacement.
04-22-2018, 08:49 PM
#9
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The crankshaft position sensor is not the step I would take next. The normal inspections and normal wear replacements are a good next step.
04-22-2018, 09:32 PM
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Year: 1994
Model: Grand Cherokee(ZJ)
Engine: 5.2
on top of the distributor we're u plug your plug wires into was sparking at the heater core hose as if it was cut but I replaced them and it stoped now so I guess I might check the pickup coil in the distributor tomorrow to see if it looks bad.
04-23-2018, 05:55 PM
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Year: 1994
Model: Grand Cherokee(ZJ)
Engine: 5.2
I got it I checked the coil with the oms metter and it was bad it was only at 10.8 I found a good one in the junkyard and out it on and had to reset the distributor and runs like a champ now
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