Question about Jeep Grand Cherokee
Dealer changed 2- o2 sensors, changed main computer, dealt w/ check engine lite 10 times, after pcm change check engine back for O2. I don't think I trust the dealers ability to diagnose anything. any thoughts?
Sure but why not ??????
post year car.?????
and engine size?
and DTCs stored. >???????
and never go to Dealers, go to ASE shop. for better help and 10x le$$.
the freakn, dealer charges $25 for a $2.5 spark plug. why go there.?
if you post all that , we can find ,it, ill give you simple tests
get your one scantool
it costs, what 1hr dealer ripoff shop labor. why be blind. get you own tool and scan it.
nows if car is pre 1996 then that tool will not work.
so YEAR is everything. and then engines.
its and engine problem , cant fix engines, not knowing what it IS.
Posted on Feb 17, 2014
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Posted on Jan 02, 2017
i would check with the dealer who changed the converter to check and see if the sensors were damaged while they replaced the converter or may be they have forgotten to hook it back up check before you throw away your good 02 sensr
Posted on Nov 12, 2008
SOURCE: O2 sensor problem
I have a 97 gmc sierra .This truck is the same as the chevy ok.Its a 350 5.7 liter 4x4 Z71.I took it to auto zone which was my first mistake.They put it the scanner and said bad O2 sensor.Ok so which one is it i said.They dont know.Well there four (4) O2 sensors in this truck i hope you know that.I had to replace all four of them before i had to take it to a real shop.It seems the fuel pump i replaced a week earlier with an auto zone fuel pump was bad.Ive changed my feul pump 4 times now and have 235000 miles on still running.You need to get your fuel pressure checked.It should be 65 psi to start it and 55 psi to run it.If the pressures are good it could be a different O2 sensor or maybe the mass air flow senor.My last option would be the fuel pressure regulator because it seems to be a waste of time and money.I would get that fuel pressue checked first.Good luck.
Posted on Nov 25, 2008
1- check there is spark come from spark wires
2- check the fire timing by looking for every wire in the right place
3- check there is injector signl
4- check for any vacuom leak
5- try to clean the MAF by brake and parts cleaner
6- try to reset all the code and see what will come after that
Posted on Mar 14, 2009
SOURCE: o2 sensor reads bad
I hope you didn't just change out 1 sensor, the car has a minimum of 2 O2 sensors, and if you have a dual exhaust system, then it will have 4 O2 sensors.
Posted on Aug 13, 2009
SOURCE: 1998 Saturn SL2 engine light
The following are malfunctions that could cause a rich condition:
^ Fuel pressure too high. Perform fuel pressure test.
^ Leaking fuel injector(s). - Perform pressure leak down test.
^ Vacuum leak around the MAP sensor grommet.
^ Oxygen sensor contamination.
^ Restricted exhaust or air intake.
^ Fuel Vapor Canister saturated with fuel.
IMPORTANT: If the front oxygen reading voltage is above 600 mV and the rear HO2S is above 600 mV all the time, the O2 sensors are probably not
Posted on Sep 22, 2009
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