After ~8 miles in summer driven hard sputters, runs does this 3-4 times & dies. Won't start till several hours later when cool.
What's been done:
New fuel pump (1 yr old), brand new borg warner crank shaft position sensor, new borg warner ICM (and retested), new ignition coils (seperate problem).
Service engin light is on most of the time buit think this is just O2 sensor(s), computer is dumb, never turns anything up on diags.
Ran with fuel pressure gage attached through problem, pressure 47 - 60 pounds during acceleration then when sputtering jumping wildly between 20 - 50 lbs. Engine temps are normal, fan & cooling system OK, AC running OK
Any next best guess/insight welcome - I also have an 87 Jeep 4L that does the SAME THING:(
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Re: 93 Grand Am 3.3, engine dies when hot
Check the airflow meter sensoe,could be distributor also if the fuel pressure is going down on acleration could be a blockage in the injectors on injector might be getting to much fuel or the airflow meteris playing up thats the best bet
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ill reduce it for you.
misfires. (is RPM below 700 then misfire can be normal) for idle speed controls dead.
ISC the isc controls speed, of idle,.
mine stuck like zillion times, in 400k miles. endless.sticking
mine was a tiny gutless stepper motor drive ISC valve.
the cone valve is side gets nasty and sticks (
(PCV gases caused as seen on all engines)
i clean it.
the proof is the easy press of right foot easy raises idle back to 700rpm and engine stops misfiring.
ever get a tuneup this decade or running spark parts 500,0000 miles
for the new world record.?
now the tricky part of ISC, , fully explained in the SM serv. man.
the PCM learns its behaviors.
it learns all hot start settings and cold
so when you key on, it goes to the correct HISTORICAL spot.
if it can move there(sticks) engine car race.
or run too slow,
cold start would be worse, as hot isc is more closed
so if sticks there closed, the next cold start will be horrid
some newer manuals telly you to add 5% throttle if car is hard starting this is so common.
first thing to replace and cheapest would be the fuel filter ,if that doesn't fix the problem , it may be the fuel pump . GM fuel pumps are in the gas tank, and they have a built in thermo fuse . when fuel pumps get old 60000 miles or so..the motor in fuel pump starts running to hot and the thermo fuse kills the power till it cools down then it will run till it gets hot again note the cool down time keeps getting longer and longer
since its a 1997 your jeep has EFI, electronic fuel injection. The most probable reason for your troubles would be the injectors or a problem with the computer controling them, not allowing enough gas to be pushed into the cylinder causing stalling or lack of power, also too much gas iin the cylinder can lead to back firing and stalling. This would also explain the reason it takes so long to start back up some times, all the excess gas in the cylinder is flooding the motor and u have to wait till the gas disipates till the engine will turn over.
Could be Lots of things Causeing that Frist Could be a Cracked Spark plug and Be your Timing out on it also could be Vacume Leack EGR stuck open or Closed Bad Wires Emissions Control System not workin Right
Check the small ground wire from the engine to the body chassis. Remove it from both ends wire brush were the lugs connect also wire brush the lugs. Install some vaseline on the connection points and tighten.
Your battery is dead, that's why the starter is not starting the engine. Install a new battery or jump the car, if it still doesn't run, lpease repose problem with more details of the status.
Please vote on my solution.
Had the same problem with 1999 Quest - turns out that the distributor was going until it finally died. It stuttered andf kept shutting off when driven about 20 miles or so. Would start normally when cooled and off again when hot. But yours could be a different problem; not sure.