I don't see fuel filter in there.

Also there is a body ground that runs from the rear of the head to the
firewall. If it goes bad, the vehicle has to steal grounds. Sometimes
it can get a good one, sometimes not...

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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wrote:
>
> Almost giving up..
>
> Renix ECU (replaced couple of years ago with Bendix)Multi point fuel
> injection, 4.0 litre inline six with manual transmission, 110K miles.
> It has been doing this over a year now,it feels like this Jeep has a
> mind of it's own...sometimes good day,sometimes bad day (mostly bad
> days recently).
> Problem is, that sometimes it just dont run over 1500rpm, it doesnt
> matter how much i press
> the gas pedal,it just sputters and rpm gauge drops to zero,it does not
> matter what gear i'm using,if i depress the gas pedal slightly then it
> keeps going slowly and rpm gauge comes back alive.
>
> But when it runs fine it really runs like it should (almost like a
> sportscar)..
>
> CPS sensor is brand new and giving nice pulses,O2 sensor is brand
> new,TPS sensor is giving smooth voltage,coolant temperature sensor is
> ok,manifold air temperature sensor is ok,MAP sensor seems to be ok,EGR
> seems to work, stator in the distributor is giving nice pulses,fuel
> pump ballast resistor is 1 ohm, (every sensor checked according to Jeep
> Renix Fuel Injection Manual) i have checked the sensors using digital
> multimeter (and oscilloscope for pulse giving sensors). I have done
> measurements near to ECU connectors (by cutting/peeling the wires).
> One strange thing is, that there is no noticeable difference if knock
> sensor wires are connected or not.. and it it was also giving knock
> pulses..more rpms,more and higher pulses. Basically my question is,what
> should i try next...
> could this problem be fuel related ?
> what are the reasons which can make rpm gauge drop to zero?
> For me it just seems to be electrical...i dont know anymore..
>
> Please answer if someone have a clue about this.