2005 misfire problems after cam and head swap - Ford Mustang Forum
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post #1 of 16 (permalink) Old 03-22-2010 Thread Starter
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Question 2005 misfire problems after cam and head swap

Well after a month of havin my car in the shop....we finally got it on the dyno and had my tuner mess with
the a/f ratio and timing....after a couple of pulls we both started noticing a misfire at wot....after checking the
datalogs....we saw about 3 different dips..02 went to 0....timing went from 30 to -64 degrees...and the maf
also dropped to 0....according to the tuner he thinks the problem might be my pcm...has anybody heard or had
this problem after cam/head swap?

Fyi: comp cam spr stage 2....cncd heads....springs n phasers were replaced

Any feedback is appreciated!

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post #2 of 16 (permalink) Old 03-22-2010
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Quote:
Originally Posted by mariogt4u View Post
Well after a month of havin my car in the shop....we finally got it on the dyno and had my tuner mess with
the a/f ratio and timing....after a couple of pulls we both started noticing a misfire at wot....after checking the
datalogs....we saw about 3 different dips..02 went to 0....timing went from 30 to -64 degrees...and the maf
also dropped to 0....according to the tuner he thinks the problem might be my pcm...has anybody heard or had
this problem after cam/head swap?

Fyi: comp cam spr stage 2....cncd heads....springs n phasers were replaced

Any feedback is appreciated!
It would be purely coincidental that the ECU is giving out after a swap of any kind. The most logical place to look would be at all the electrical connections including grounds first.

Did the ECU set any codes?


"You can't fix stupid"

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post #3 of 16 (permalink) Old 03-23-2010
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i dont think its an ECU problem,,,,those SPR cams need a good tuner:smilie
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post #4 of 16 (permalink) Old 03-23-2010
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Quote:
Originally Posted by 10/05gt View Post
It would be purely coincidental that the ECU is giving out after a swap of any kind. The most logical place to look would be at all the electrical connections including grounds first.

Did the ECU set any codes?
I agree check the grounds.


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post #5 of 16 (permalink) Old 03-23-2010 Thread Starter
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I had a problem before with the grounds...and the car wouldn't work at all....it could be on for like 3 minutes and then just turn off
This problem is only at wot at about 5k and only in 4th gear................p0301....p0316.......p1000.... ...are the codes I'm gettin...the 1st one says misfire in cylinder1 detected....n the
2nd 1 says misfire detected 1st 1000 rpms.....these are the codes its throwing:?:
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post #6 of 16 (permalink) Old 03-23-2010
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Quote:
Originally Posted by mariogt4u View Post
I had a problem before with the grounds...and the car wouldn't work at all....it could be on for like 3 minutes and then just turn off
This problem is only at wot at about 5k and only in 4th gear................p0301....p0316.......p1000.... ...are the codes I'm gettin...the 1st one says misfire in cylinder1 detected....n the
2nd 1 says misfire detected 1st 1000 rpms.....these are the codes its throwing:?:
The P1000 is ECU not ready. Basically it throws that code when the ECU has not been able to complete all it's self tests. A bad ground or connection can cause that or a problem with the ECU. It will also sometimes show up when the battery has been disconnected for a long time. Check the ground connections that are on the raditor support under the radiator cover. They are on passenger side by the ECU.

As for the misfire codes I would still lean towards a bad connection. Check the COP and injector connectors. If you don't see anything obvious then swap #1 COP with one from the other engine bank and see if the code moves. If it moves then the COP is bad. If it doesn't move then check the spark plug.

You may not be able to really feel a random misfire at idle or cruising speed but it will normally show up under load like your seeing in 4th gear.

Try that and let us know what you find

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post #7 of 16 (permalink) Old 03-23-2010
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Agree... Bad connection, broken pigtail or failing coil(s).

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post #8 of 16 (permalink) Old 03-23-2010 Thread Starter
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Well we changed the spark plugs n switched the coil from #1 to #5...n no backfiring after a couple of miles of drivin
....but no change w the p1000 code...and also its throwin 1 that says dat the timing on the camshaft is too advanced
I guess ill let my real tuner tell me wut dat is exactly...gotta wait till thurs or fri though....do u guys think it'll be safe
To drive about 400 miles....as long as I don't floor it?
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post #9 of 16 (permalink) Old 03-23-2010
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P1000 should disappear after a few driving cycles.

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Quote:
Originally Posted by mariogt4u View Post
Well we changed the spark plugs n switched the coil from #1 to #5...n no backfiring after a couple of miles of drivin
....but no change w the p1000 code...and also its throwin 1 that says dat the timing on the camshaft is too advanced
I guess ill let my real tuner tell me wut dat is exactly...gotta wait till thurs or fri though....do u guys think it'll be safe
To drive about 400 miles....as long as I don't floor it?
The P1000 should go away like stl said. The cam timing over advanced could come from the ECU software still looking for full cam timing retard if your current tuner didn't adjust the cam timing tables in the ECU. The limiters stop the cams at around 20*s of timing retard. If the tables were not changed like the instructions with the limiters say to then that may be why your seeing that.

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post #11 of 16 (permalink) Old 03-27-2010 Thread Starter
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Wuts up guys! Well, I finally got the stang to the right person....I am amazed at wut a difference
This guy made...I am reaLly happy with the results...thank you to all for all the help!
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post #12 of 16 (permalink) Old 03-27-2010 Thread Starter
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Richard at strictly performance in houston.....told me that he could get some more out of it but he needed some more time
to do some more tweakin....so hopefully next week it'll be back on the dyno and maybe I can post the results!

Thanks again to every1 that posted u guys were a lot of help!
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Quote:
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Wuts up guys! Well, I finally got the stang to the right person....I am amazed at wut a difference
This guy made...I am reaLly happy with the results...thank you to all for all the help!
Good deal.....glad to hear that

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So it was all in the tune afterall.

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So it was all in the tune afterall.
i said its a tuner problem but no one listened,,,

glad to hear you got it solved out

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