i have an 02 bonnie did a motor swap on it ran fine then it stalled and has the CEL flashing at first i had p0303 and p0203 tested the injector wireing and no signal so got a new used computer got signal back and had to change injector now p0203 is gone but still have CEL flashing and p0303 changed plugs and wires and coil and new cam and crank sensors when swap was done also had a spare ignition control module i tried (not sure if it was good) still code is here any ideas thanks

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have you cleared the code? it may take many starts for pcm to clear the code so it may be lit but the code really is in memory. if its cylinder 3, focus on that one - check gap, .060 and wires and coil that feeds it. so , on the bank closest to the rad, it is the cylinder to the far right - near air intake box

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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

To the far right is #5 right i have a scaner and erased the code I didn't check gap on plugs when I installed them will check tomorrow did a compression test and got 170 and both intake gaskets were changed when I did motor swap

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Past toys
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81 T/A
88 century t-type
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99 firebird
99 gtp

yes, your're correct - middle front is 3 - sorry

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

You may want to do a compression check.

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*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.

I did a compression test on #3 got 170psi but I cheated didn't pull all the plugs

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Past toys
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81 T/A
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yeah, you should do it properly and do both banks to get a good baseline to compare with #3.
you take this opportunity to inspect and test the coils, wires and plugs for proper condition terminals and connection.

......this will guide you .....http://easyautodiagnostics.com/gm/3.8L/ ... ck-tests-1

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

I have tested all 3 coils testes fine I even bought a new one for #3 plugs and wires are new I'll pull all the plugs and do compression test tonight.

_________________
Past toys
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81 T/A
88 century t-type
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99 firebird
99 gtp

Maybe you have a defective spark plug.
You didn't mention the brand you're using but for whatever reason Bosch spark plugs are no good in our 3800 engines.

I am using ngk g power plugs and federal wires i think I'm going to do a leak down test on coolant I used advanced auto junk gaskets when doing the lim uim

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Past toys
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81 T/A
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99 firebird
99 gtp

Can't hurt to do a coolant test.
Swapping wires and plugs just to see if the miss moves would also be a wise move.
I'd be very surprised if the NGK plug was at fault but it's possible that it is cracked or just a random dud.
You can also swap injectors to eliminate an injector issue.
I'd even double check that the wires are fully seated at both ends.

Well I swapped the wires around and code still 303 pulled the plug it was wet and smelled like gas I cleaned it and spark is blue now on #3 wire cleared codes started car and got 303 again

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Past toys
79 T/A
81 T/A
88 century t-type
93 regal
99 firebird
99 gtp

Do a cylinder drop test. If the CEL is flashing, that's a major misfire, such as a spark plug shorting to ground. Something is preventing that cylinder from firing all of the time. You may want to pull the valve cover off and watch the valves as it turns over and see if you have a sticking valve or a collapsed lifter on that cylinder. The leak down test might not show the valve sticking if it's had a chance to close.

Another thing I would do is put a vacuum gauge on it and watch for fluttering...that would indicate a valve issue quickly. If the vacuum reading stays steady while the engine is running, then you can rule out the valve train.

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A temporary fix does not exist. It becomes a solution until it needs to be fixed again.

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SO did you check gap ........060 inch? you cant always trust the guy at the factory to get it correct.

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

Unless the gap was way open or way closed, I doubt a spark plug gap would cause a flashing misfire DTC.

_________________
A temporary fix does not exist. It becomes a solution until it needs to be fixed again.

https://photos.google.com/album/AF1QipOYkkevV0gKTHc_8Cstuy8yS1Qyx6SiIKeTzuHy

Well I rented the bleed down kit but just my luck it doesn't fit my car I did notice that the air bubbles keep coming out when bleeding the coolant system so I'm thinking it is the lim gasket

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81 T/A
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93 regal
99 firebird
99 gtp

I want to change the lim gasket this weekend but dealer doesn't have them in stock where is the best place to get them online i heard of a revised gasket anyone have any info on them

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Past toys
79 T/A
81 T/A
88 century t-type
93 regal
99 firebird
99 gtp

BUBBLES? so what was the results of your compression test?, was #3 very low?

here is some info on series 2 3800.....yours may be 2 or 3 - be sure you get the correct parts

Series 2
Part # ............Name.................................. ...............Rockauto
Fel Pro
ES70599...........Fuel Injector O-rings (need 3)....................$1.91
MS95744...........Plenum (SC to LIM) gasket w/rings (L67).....$8.43
61024..............Throttle Body gasket (L67)........................$3.52

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

I had 175psi on #3 bit couldnt do a leak down test parts store kit wont fit bit also has the 3.4 pulley on it was running great and I was getting on it hard and then started its problems i think i used felpro gaskets from advanced whaen i did motor swap

_________________
Past toys
79 T/A
81 T/A
88 century t-type
93 regal
99 firebird
99 gtp

that reading seems to be good - the others were the same?

I would switch the plug and wire with another cylinder and see if the miss goes to it.

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am