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Old 08-06-2015, 10:50 PM   #1
Jack Black
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1999 SW2
Default p0300 chaos

Its driving me nuts.. New plugs, wires, coil towers clean and tested, ICM proved working.. Checked for lose motor mounts and other mounting brackets.. EGR cleaned and swapped for know good unit .. MAP sensor r and r'ed .. Fuel rail swapped from old engine, carb cleaner sprayed on fuel rail o rings and intake.. Oh shoot, this is a 99 DOHC that was swapped in place of another DOHC with a burned exhaust valve.. Should I be checking the ground by the starter for issues? Serp belt is newer, alt bracket tight.. AC was recharged after swap, when engine stops the clutch can be seen turning back wards a couple of times, not sure if that's normal.??. What didn't get swapped was the knock sensor or ckps.. Is there supposed to be a relearn for the PCM with a different ckps in place? The MPG is down around 28, usually averaged 33/34.. I may go double check FP, the fuel filter was replaced about 15000 miles ago with the Wix/NAPA part.. And yes, I tried to find other posts here related to p0300, and walked through with them..

I'm kind of stumped... TIA

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Old 08-06-2015, 10:54 PM   #2
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Default Re: p0300 chaos

My scan tool does not display info as to life data, but the Mac it was connected to would show misfires on cyl 2 and 3 starting around 1500 rpm.. Made me think coil pack but the swap with 4/1 showed it was working correctly..

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Old 08-06-2015, 11:02 PM   #3
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Default Re: p0300 chaos

On its recent smogging, the HC's were higher, 75ppm I believe... It should be way lower than that.. That alone is telling me its running rich.. I need some run time to settle in the STFT and LTFT readings after changing the MAP out..

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Old 08-06-2015, 11:05 PM   #4
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1998 SC2
Default Re: p0300 chaos

How did you validate the ICM was functioning correctly? Have you cleaned and inspected the ICM connector and socket? Clean with CRC QD-Electronics Connection Cleaner. Do not use any grease on this connector except very lightly on the environmental seal.

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Old 08-06-2015, 11:10 PM   #5
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1998 SC2
Default Re: p0300 chaos

STFT is dynamic, ignore it for trends. LTFT is only loaded into a table when at idle and steady throttle cruise. If you are getting misfires then the LTFT is of minimal value.

What are you using for plugs?

Have you run a compression test?

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Old 08-06-2015, 11:11 PM   #6
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Default Re: p0300 chaos

The ding bat that installed the motor insisted my ICM was bad.. So he ordered new one installed it with a foot in his mouth, because his MAC scan tool continued to show the misses in 2/3 .. He was mad as hell when I told him he could try it, but I figured my original ICM was ok.. The car never had a p0300 before I let the twit mess with it..

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Old 08-06-2015, 11:18 PM   #7
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1999 SW2
Default Re: p0300 chaos

The V powers, and I know your going to smack my hand for using the bosch wires, but this is the second set of bosch and used a set of Delcos with the same results... He claimed the compression was 195 all the way across... I may have to double check that myself... Front cat is void now too..

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Old 08-06-2015, 11:21 PM   #8
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Default Re: p0300 chaos

running rich- misfire- how about fuel injectors? first use a stethoscope or screwdriver to check for sound. possibly pull them out and put them in a plastic bag or jar to check for spray consistency. it takes both spark and fuel to run smooth. sounds like to much gas to cylinders.

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Old 08-07-2015, 12:33 AM   #9
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1998 SC2
Default Re: p0300 chaos

The second thing to do is go to a pick and pull and get a 96 or newer DIS module(2 coils and ICM) and install it. Do not run to the parts store and buy a aftermarket coil or ICM. Get the connector as well with a good chunk of pigtail on it.

The first thing to do is connector cleaning. There is the possibility this is a bad connection on the 2/3 coil trigger. So the $8.00 fix will be connector cleaning.


You can listen to the injectors or feed it a 12oz bottle of Chevron Techron Concentrate in 1/2 tank of gas and see if it runs better.

This was not broke until the ICM swapping started.

Do a compression test to max pressure and count the compression strokes. Crank it until the gauge quits increasing for 2 compression strokes.

Last edited by OldNuc; 08-07-2015 at 12:46 AM..

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Old 08-07-2015, 12:33 AM   #10
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Default Re: p0300 chaos

What year DOHC was swapped in?

Attached the FSM P0300 diagnostic aid, not sure how much the scan tool stuff can be done with a Tech II knockoff.
Attached Images
File Type: jpg 1.jpg (135.2 KB, 8 views)
File Type: jpg 2.jpg (93.8 KB, 6 views)
File Type: jpg 3.jpg (199.6 KB, 7 views)

...
The proper way to fix a S-Series automatic is to replace it with a 5spd O:)

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Old 08-07-2015, 06:57 AM   #11
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Default Re: p0300 chaos

Was the coolant sensor replaced with the brass one?

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Old 08-07-2015, 09:29 AM   #12
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Default Re: p0300 chaos

Had a po300 a few months ago, car felt like it was gonna blow up, a new ICM
and coils (fromRockauto) solved the problem.

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Old 08-07-2015, 04:05 PM   #13
Jack Black
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Default Re: p0300 chaos

The motor was a late 99 that went in, some 30000 higher production number, even had the tie plate for the mains. The ects has the brass style, I'm sure it was replaced on the recall, white wires and the connector was clean.. I can hear the injectors pulsing... I am going to double check the connector, clean it up with a little acetone ... If that doesn't work it's time for a jy connector... As long as it is 96 and up I should be fine if I understood Nuc... I presume the ICM doesn't matter if it's sohc or dohc ?

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Old 08-07-2015, 04:08 PM   #14
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Default Re: p0300 chaos

When I get home I'll look at the FSM's.. Sometimes smart phones suck cause I can't read worth a **** from them.. Love this place..

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Old 08-07-2015, 04:37 PM   #15
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1998 SC2
Default Re: p0300 chaos

Inspect the 2 wires from the ECTS back to the crimp connectors, cut them out and properly solder those wires. That may not fix the p300 but it is a start.

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Old 08-07-2015, 05:49 PM   #16
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Default Re: p0300 chaos

A crank relearn may be needed. This is a different engine than the vehicle originally had.

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Old 08-07-2015, 08:45 PM   #17
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Default Re: p0300 chaos

That is not out of the question either but you can not do the relearn if you are setting random misfire codes so that has to be fixed or minimized to the point you can get the relearn to run

OP. if you can clear the p300 can you idle the car until it is fully warmed up without setting a code? IF no then warm up the car, shut it off, pull the PCM B fuse to clear all codes and reset, start car and watch the SES. IF the SES starts flashing then accelerate to 3000-3500 RPM and hold it there until the SES goes out. If no code sets at idle then watch the SES and if it starts flashing continuously accelerate to 3000-3500 RPM and hold it there until the SES goes out. This is the DIY crank relearn.

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Old 08-07-2015, 08:47 PM   #18
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Default Re: p0300 chaos

Quote:
Originally Posted by bluesl2 View Post
A crank relearn may be needed. This is a different engine than the vehicle originally had.
It is very rare for the relearn to be required, has happened maybe once or twice but it could be the answer here.

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Old 08-08-2015, 04:05 PM   #19
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Default Re: p0300 chaos

A bit of an update.. MAP changed Thursday, LTFT at 65 is remaining stable, found a disconnected sensor related to Secondary air system disconnected under the intake.. EVAP monitor set ready, fuel mileage has increased. This as stated, the fuel trims have nothing to do with the misfire if I am right..

I can still trigger the flashing CEL, at a higher RPM 4500-5000 while traffic merging is now where I am seeing this.. But the car runs smoother at idle after I cleaned the pins on the ICM connector..

JY trip this morning netted me a pair of coils and a genuine GM ICM .. I realize looks are not a great indicator, but the brass grounds on the coils and ICM look to be in a like new appearance, very little patina on the brass surfaces.. Also got a the pig tail for the ICM, cut back to the harness.. So I am waiting for both the car and a couple of beer to cool down..

Now as far as the ECTS, I have ran into the (s)nag before, and it was very apparent on the scan tool it was not functioning properly by the 30f temp swings.. This one is remaining stable, and the T stat is a fairly new NAPA/Stant 195, the one recommended by the forums..

I'll go get the car warmed up to operation temps and pull fuse and see what I get..

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Old 08-08-2015, 04:30 PM   #20
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Default Re: p0300 chaos

Inspect the ECTS wiring, it only takes 5 minutes. If there are splices in it the mixture will be all fouled up because of them.

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