Okay folks, you may have seen some of my recent posts… Im having
some troubles and im stumped! My wife wrecked our 95xjs last
month. I bought a 97 xjr with 85000 miles and had it shipped to me
here in NJ… I believe the dealer when he said it ran fine there
when he took it on a test drive before I agreed to buy it…
Anyway, the car had been sitting for 7 months. When it arrived
here, the car hauler had to jump start it… I hoped in and drove
it down the driveway, but it sputtered and hickuped when I touched
the gas… When I got into the garage, I popped the trunk to see why
the had to jump it. I assumed a dead battery was to blame for the
miss… It had a brand new battery in it, but the bolt to tighten
the ground terminal was broke. I grabbed some vise grips and
clamped the terminal tight with the grips and went for a test
drive. it went great for about 10 miles, I hit a good bump, and the
car started missing again and sputtering and mild pops from the
exhuast when I hit the gas at all… I pulled over and the grips had
popped off… Put them back on, and the car was fine… went 10 more
miles to home, and proceeded to get the broken bolt out of the
terminal. Fixed it, charged the battery fully, and tightened it up
good… Got in the car, and 2 miles down the road its missing bad
again… This is where the fun starts. Its been doing this since…
Goes a few miles, and then gets a bad miss… Sometimes I can go a
few miles, sometimes 10 miles. Seems better the warmer the air is.
If its missing, I can stop, or shut it off, and the restart and its
good for a few again. I am getting Multi cyl misfire codes, and
others related to same…
This is what I have done so far:
Drained fuel tank. refilled and added new water remover for closed
vent systems and ethanol gas. didnt help… ran that tank out, and
refilled again.
Pulled sending unit and looked in tank. all clean.
Changed fuel filter.
Tried 3 different batterys.
Replaced spark plugs with recommended champions (#12 ones)
Replaced all 6 coils from wrecked 95 XJS.
Swapped pin layout for dual fuel pumps so other pump is used as
main pump.
Cleaned MAF sensor.
New air filter.
Checked all plugs and connections under hood and in the trunk.
Borrowed snapon scan tool to read and clear codes… Checked all
sensors. All looks good. Friend with scan tool as a top notch ASE
Master tech. He is stumped too… O2’s good, temp sensor good, MAF
good, etc.
02 trims are a bit high, but not out of range. So it is calling for
a little much on fuel. Fuel mileage is HORRIBLE… about 10-12 mpg
highway. Plugs have black soot on base ring.
The car is driveable if you dont touch the gas. will cruise at 70
and get horrible gas mileage. Sometimes it will start to run good
and it is a rocketship… have gone 18 miles running and flying
good, only to revert back to this BS.
Any clues?!?! Im getting sick over this! I’ve never been stumped
like this!
Thanks!
Ron–
eyeinstine
North Hanover Twp/NJ, United States
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