Lately the engine has been running choppy/sputtering. I though I had
picked up some bad gas. Ran the tank and put in some new gas as well
as some fuel injector cleaner. Still choppy/sputtering. Gave it a
tune-up with new
Still was choppy/sputtering. Cleaned the MAF sensor as per the
instructions found here in the newsgroups. Still choppy/sputering.
Anybody have any ideas on what is causing this? Thanks for your help
Choppy/sputtering doesn't tell me much. Describe as completely as you can
how the engine runs. Does it have the problem at idle? At part throttle?
At full throttle? At all engine speeds? Only under load? Only when
cold/hot? Is there any surge, hesitation, or loss of power? Any problems
starting? Is the MIL on?
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Sometimes runs smoothly - shifting and all that - sometimes shift into
2nd gear or 3rd/4th/5th and the engine chokes like it needs something
(air/fuel) -- it goes from running good to bad and back - no specific
firstname.lastname@example.org (icepal1999) wrote in
Sounds like a fuel starvation problem to me. Check for bad fuel pump,
clogged fuel filter, bad O2 sensors, bad TPS, sediment in fuel tank, bad
injectors, and bad ECM. If the problem is easily reproducible, I would
save some time and take the car to a Ford dealer to have them diagnose the
problem. They can determine if its a fuel or ignition problem, and can
usually tell you which part(s) to replace, though sometimes they are wrong.
That will cost you about $80.
MIL = malfunction indicator lamp, aka "check engine/X light." If it's on,
pull the codes and you might get a clue.
No "Check Engine" light. I've been looking on Ebay for that code
scanner so I check the codes myself. The fuel filter is new -- so i
can rule that out. I will check out the other things and get back here
to post ASAP.
On 9 Jul 2004 13:09:28 -0700, email@example.com (icepal1999) wrote:
Please check your error codes. My 91 with the 1.9 engine NEVER had a
check engine light even thought the error codes said a Bad O2 sensor,
bad TPS and Bad MAP. After replacing all 3, the error codes went away
and the engine ran fine. Oh yes had the sensor on the trans replaced.
I broke it, cost me $350 to have service guys do it.
Conclusion, Don't trust the Check Engine Light.
By the way, the final fix of the TPS fixed all my rough running.
Very possible the bad TPS causes all codes, as it is a primary input.
It the TPS was faulty, it could force the engine too rich or too lean,
beyond the capability of the O2 sensor to correct. This would throw an
Having the TPS show WOT and the MAP showing low MAP would throw a MAP
Changing the TPS first MAY welll have cured all 3 codes at once.
Or, the O2 sensor may have been damaged by running too rich, for
instance, and required replacement as well.
The chances of all 3 failing at the same time are somewhat remote -
but not impossible.
had this problem when i was going on a sky trip .
blew it off as an altitude change problem.
don't drive my GT any more. engine is rebuilt but the frame is seperated
from the body.
afraid if I put on the brakes part of the car will stay behind. LOL
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