ground issue or battery cable issue until proven otherwise

 

I have already checked and cleaned both grounds and battery and it is still happening

 

both grounds??? more than 2 on that vehicle
also inspect battery cables where they enter the battery clamp

 

starts and runs perfectly till i hit a bump

 

yes, both g107 ang g108 where taken apart and cleaned battery terminals are brand new

 

makes me think dirty loose corroded ground

 

again i have cleaned and tightened any ground related to the cluster and radio. it has not fixed any problem i did notice that my driver side cigarette light and radio share a ground could that lead to what im experiencing ?

 

engine to unibody ground condition?

 

dirty but the ones i had checked weren't torn just covered in dirt from previous wheeling trips i did clean both the ground eyelet and terminal same problem

 

there are three main things that need to be grounded to each other
1) battery negative
2) engine/alternator/starter
3) unibody

alternator has to have a path to pump electrons to unibody to power PCM and radio and lights and cluster (electrons actually flow from ground as they are negative charge particles)
that path is the engine to unibody ground strap
typically rear of engine to firewall

 

i have only checked g107 and g108 i will take a look at the others. would a bad distributor ground cause the engine to shut off entirely?

 

a bad body ground will cause PCM to loose power and thus kill the engine

 

thank you very much will look farther into it so glad i finally joined this community

 

I have a 99 XJ 4.0 and I’m having the exact same problem. Anytime I’m driving and I run over or hit a bump or drive on a rough surface RPM gauge jumps and the vehicle jerks and the engine will shut off. Please let me know what you did or planning to do to fix this issue thanks.

 

well i had tested and clean all the main grounds on the engine and that didn't do it but i took a look at my starter and found the positive wire running straight to the battery, it had been chewed halfway through at the upper control arm. whoever did the starter last didn't secure it out of the control arms way i guess

 

I had a bad sense wire connection on the Throttle Position Sensor. Plug was defective. I didn't feel like replacing the plug, so I just bypassed it. To discover this I opened the hood, started the engine and proceeded to shake every cable. Took all of 30 minutes + another 15 to fix it.

 

@ Stompy8488 All that means is starting will be intermittent. The "engine running" battery cable goes to the PDC. That is the one that powers everything other than power to the starter. If cable is bad, lights will go off, engine will stall, IOW, you will be able to quickly find the issue. On some models, the wire you discovered has a fusible link. When that cable shorts to ground. Large quantities of smoke followed by fire are the results.