DTC P0200, P0303, P0300

DTC P0200, P0303, P0300

Postby paulo57509 [OP] » February 17th 2012, 5:23am

'03 Safari with LU3. This was my Dad's van and it doesn't get driven very much since he passed in '09. I try to drive it on a long trip (120 miles or so) once a month in between a few short trip around town to get the engine up to temperature. I also try to keep at least a 1/2 tank of fresh fuel in it with some Sta-Bil added.

Started up the Safari (coolant cold) , pulled out of the garage and got a couple of blocks down the street when the engine started to miss. Blinking CEL. Turned around and put it back into the garage. I didn't want to continue to drive it with a dead cylinder not knowing if it was fuel or an ignition issue; I've killed a couple of cats on other vehicles driving them with raw fuel running through the engine. Believe me, it doesn't take much.

I finally got around to reading the DTC's and there are three of them. P0200, P0303, P0300. I ran the engine for a minute or two, the miss is still there and the CEL is now on and steady. I know what the codes represent.

I need to run the engine to perform further diags, but I'm hesitant to do this because of my fear of cooking an expensive exhaust component. I'm sure that the P0200 is the cause of the P030x DTC's, but I'd like to confirm that a P0200 indicates a fuel injector problem only and not a ignition problem.

What say the membership?

From a search of the Forums, I find it interesting that most P030x DTC's that are reported by others is a #3 cylinder miss.

Another question #1: If I follow the diag flow chart in the FSM, I need to probe the injector harness and ultimately will need to access the offending injector plug. Can this be done without having to remove the upper intake manifold? I'm thinking maybe the #3 injector is hanging up.

Another question #2: Is there an available fuel pressure test port and where is it located?

Surprising that the FSM is really lacking in this level of detail.

TIA
Original Poster [OP]
paulo57509
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
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Re: DTC P0200, P0303, P0300

Postby Phantom » February 17th 2012, 1:03pm

paulo57509 wrote:'03 Safari with LU3.

Blinking CEL. Turned around and put it back into the garage. I didn't want to continue to drive it with a dead cylinder not knowing if it was fuel or an ignition issue; I've killed a couple of cats on other vehicles driving them with raw fuel running through the engine. Believe me, it doesn't take much.

I finally got around to reading the DTC's and there are three of them. P0200, P0303, P0300.

I need to run the engine to perform further diags, but I'm hesitant to do this because of my fear of cooking an expensive exhaust component. I'm sure that the P0200 is the cause of the P030x DTC's, but I'd like to confirm that a P0200 indicates a fuel injector problem only and not a ignition problem

From a search of the Forums, I find it interesting that most P030x DTC's that are reported by others is a #3 cylinder miss.

Another question #2: Is there an available fuel pressure test port and where is it located?

TIA

A Blinking CEL is telling you that it is urgent that you fix repair before driving any further or you can damage something ,

P03000 is random misfire which could be any cylinder P0303 is cylinder #3 can be injector , dist cap or plug wire or dist screens can cause the P0300 random misfire , plug wire or injector can cause the P0303
if you use a live data scan with a quality OBD2 scanner you can see which cylinder is misfiring and fuel trim that will show if you have a leaking injector
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Re: DTC P0200, P0303, P0300

Postby paulo57509 [OP] » June 25th 2012, 2:48am

Just to close the loop on this, I finally got around to working on the van yesterday.

Replaced the #3 injector and the engine runs as it should. I didn't clear the codes as I was always taught to let them clear on their own.

Just one issue had me stumped:

viewtopic.php?f=43&t=15408
Original Poster [OP]
paulo57509
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: paulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full yearspaulo57509 has been a member for 11 full years
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Topics: 24
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Joined: October 2009
Location: Central Valley/Bay Area CA
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Van Model Year: 2003
Van Make/Model: GMC Safari
Extra Info: RWD


 
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