CEL solid and flashing

05-14-2005, 02:40 PM
Ok my story starts out that the CEL came on and was solid at first and then would flash when you would acclerate, at a stop while in gear the truck would stutter and act like it wasnt getting enough gas. took it to auto zone had the codes read P1275, PO463, P1340, P1311, P1312, PO300, PO140, P1340, P1312, P300. Ok i had bosch plat spark plugs thought that this was the main problem with the stuttering and the misfiring, went to the dealership and bought OEM plugs installed noticed a little difference, but didnt fix. Yesterday bought and installed the O2 sensor, thought the sensor would fix the rest of the problems, no. Today went back to auto zone to had the codes erased and see what came up and i got P1275, PO463, P1340, P1311, P1312, PO300, PO140, and PO300. the truck still stutters at a stop and the CEL is still flashing at accleration and soild when sitting still. What is the ion sensing module, what does it do, what are the P1275 and PO463 feul codes and how do you fix them?

05-14-2005, 03:29 PM
Which O2 sensor did you replace? P0140 refers to Bank 1 Sensor 2 which is the passenger's side after cat sensor. I doubt that replacing the bad O2 sensor would fix the other problems.

05-14-2005, 03:34 PM
I replaced the B1 S2

05-15-2005, 02:54 AM
...went to the dealership and bought OEM plugs installed noticed a little difference, but didnt fix...

Were these denso spark plugs? Denso's are the only ones (known so far)that will work on the 2000+ 3.2/3.5L A flashing CEL indicates a misfire. Make sure the coils are seated properly.

05-16-2005, 03:31 PM
the plug itself said champion, the only thing that the package said was the make/model, and engine type. Every time that the OBDii was hooked up it said something to the extent of the ion sensing module and that code came up at least 4 times?? In my Haynes book there is no mentin of such..so what is ti and could that be the problem??

05-16-2005, 04:31 PM
this is the V6 correct?

.... and you reset the codes via the code reader.....

Have you tried to reset the codes by disconnecting the battery?

The one time I had a flasing CEL was when I cleaned out my throttle body with carb-cleaner. Started it, ran fine but flashed on accel. Turned off, restarted and it was gone.

05-16-2005, 06:47 PM
...the plug itself said champion, the only thing that the package said was the make/model, and engine type...

You need to run denso's on the models with ion sensing. They are not easy to find. Try www.sparkplugs.com if you cant get them locally.

05-16-2005, 08:29 PM
even though the light is flashing, the car is still misfiring. After the O2 sensor was put in I disconected the battery and let it sit for like 30 min. Connected it and it came right back on and flashed with accl. had the guy at auto zone clear all the codes, drove around the parking lot, CEL came back solid/flashing read the codes again and got P1275, PO463, P1340, P1311, P1312, PO300, PO140, and PO300. But from what i under stand the 'ion sensing module' is actually in the spark plug?

2000 Rodeo
3.2L V6

05-16-2005, 09:42 PM
my 2001 is doing the exact same thing.....the codes from Advance Auto Parts is PO463 and then Fuel Level Sensor A....Circuuit High Input

My problem is primarily after it has sat for 8 or more hours......any idea?

05-16-2005, 09:43 PM
replace ion module
replace fuel sending unit
take to dealer fo APS 1 code
take to dealer for 02 code have seen broken wires in harness set this code dont let them replace the harness it can be repaired for much less

05-16-2005, 11:26 PM
This was posted on another thread and I have cut and pasted it here (with some editing) in hope of a response.

I'm new here so I'll just start talking. I have a 2000 Rodeo (4 cyl) with 66,000 miles that suddenly started vibrating and missing while at idle. At times you can feel the engine lug and surge while driving. Went to AutoZone for a read out and got the P0300 code (random multiple misfire. Yay) My friend, who is an automotive repair instructor, and myself went out and bought new plugs (Denso's), wires (NGK), fuel filter, air filter was fine, cleaned the throttle body, EGR valve, IAC, fuel injectors, and anything else we could think of.

Unfortunately this did not fix the problem. Upon restart the CEL went off but later came back on with a flashing vengance. I returned to AutoZone and found that the engine was still giving me the P0300 code. I called a friend of mine and he told me that it sounded like I must have gotten ahold of some bad gas (this has happened to him before). He recommended that I put Gas Dry and Sea Foam in the tank to see if that will clear out this issue. It was hard to start this morning but seems to be running a bit better, however, the longer it idles the harder it vibrates. If this problem is still there when I am done with this tank of gas should I change the intake manifold gasket? I would take the truck in to have a diagnostic run but that is going to cost me 80.00 and if they have to change the gasket it is going to be more expensive than what I can afford. Besides, some of the Isuzu techs said that they have seen this problem come in before so they do a tune up, the truck comes back and they change the IMG...and it still idles rough! They said that it seems to be more of a problem with 6 cylinder trucks.

My friend asked one of his Isuzu tech friends about the problem just to find out that they have been having problems with the head gaskets needing to be repaired on the 4 cylinder engines (a 900.00 repair job). Anyone heard of head gasket failure with the 4 cyl.? I do have the 10year/120,000 mile warranty and found that it should cover gaskets and seals as per my warranty booklet and the Isuzu website.

I do apologize for the long post but any suggestions will be appreciated.


05-17-2005, 09:19 PM
Well, I found out what was wrong. My truck had "jumped timing". The poor tech tore that thing apart because he was stuck as to what the problem could be but when all was said and done it turned out to be the timing. Lucky for me, they waived the fee for the two-hour diagnostic and just charged me to fix the timing. Oh yeah, he took my Denso plugs out and put regular NGK's in as well but he left my NGK wires in.
Now I can stop stressing.....for now. :)

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