perhaps fuel pump issues
#1
perhaps fuel pump issues
So my 98 xj 4.0 has a couple problems that I think I've linked to fuel pump issues. Rough idle, hesitation, occasionally stalling, also another issue when the engine won't accelerate right after takeoff. Newer plugs wired, cap and rotor, cleaned throttle body, opinions welcomed
#3
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Year: 1993
Model: Cherokee
Engine: 4.0 HO
#5
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Year: 1993
Model: Cherokee
Engine: 4.0 HO
#6
[QUOTE=
his symptoms are almost identical to mine .. CPS culprit
and .. changing all throttle body sensors to Echlin / Napa ... runs way better shifting[/QUOTE]
So what were your exact symptoms???
his symptoms are almost identical to mine .. CPS culprit
and .. changing all throttle body sensors to Echlin / Napa ... runs way better shifting[/QUOTE]
So what were your exact symptoms???
#7
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Year: 1993
Model: Cherokee
Engine: 4.0 HO
No Codes shown .. stalls with no warning or reason .. fires right back up in neutral (while rolling even) or park .. then fine for 50-100 miles .. then stall out of blue
slight misfire now & then .. Rough idle, hesitation, occasionally stalling, also another issue when the engine won't accelerate right after takeoff or stalling on takeoff or rounding a corner
bucking on highway when it should be switching gears / idle adjusting correctly to said shifting also .. ghost stalls .. rough starts (sounds like a tractor, then picks up to idle)
I lost the link for testing CPS connector with engine off. will look for it
unplug it .. run multimeter across 3 pins a-b, a-c, b-c .. apparantly b-c should be infinite / open signal / no resistance
I got weird readings on all .. quick resistance then infinite .. or resistance .. or infinite .. or stable # .. then I would switch my red/black probes - complete other readings
I just called it toast, driving great now, shifting esp..
other tests include voltage .. I didnt do that, I felt ok replacing it .. after seeing it go berzerk with no power / multimeter
and spent the week prior: tested fuel pressure OK, I tested it for 1/2 hour ... shop ran it for an hour or more on scope / pressure tester .. nothing found .. would only stall while driving
slight misfire now & then .. Rough idle, hesitation, occasionally stalling, also another issue when the engine won't accelerate right after takeoff or stalling on takeoff or rounding a corner
bucking on highway when it should be switching gears / idle adjusting correctly to said shifting also .. ghost stalls .. rough starts (sounds like a tractor, then picks up to idle)
I lost the link for testing CPS connector with engine off. will look for it
unplug it .. run multimeter across 3 pins a-b, a-c, b-c .. apparantly b-c should be infinite / open signal / no resistance
I got weird readings on all .. quick resistance then infinite .. or resistance .. or infinite .. or stable # .. then I would switch my red/black probes - complete other readings
I just called it toast, driving great now, shifting esp..
other tests include voltage .. I didnt do that, I felt ok replacing it .. after seeing it go berzerk with no power / multimeter
and spent the week prior: tested fuel pressure OK, I tested it for 1/2 hour ... shop ran it for an hour or more on scope / pressure tester .. nothing found .. would only stall while driving
Last edited by dogkatcher; 12-01-2015 at 11:11 PM.
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#8
I wouldn't believe it if it didn't work for me. Sane issues. Changed CPS, rotar cap plugs and wires. Fuel filters and still had the problem. My grandpa told me to check to ect. It was a little corroded but figured if buy another one. Fixed all my problems from starting and idleing driving. Sounds silly but 11 bucks was worth it to me
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