2003 3.8 bad engine miss-nightmare! - Ford Mustang Forum
View Poll Results: 2003 3.8 engine miss-nightmare!
2003 3.8 engine miss/nightmare 2 66.67%
engine miss 3.8 2003 nightmare 1 33.33%
Multiple Choice Poll. Voters: 3. You may not vote on this poll

 
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post #1 of 7 (permalink) Old 01-21-2011 Thread Starter
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2003 3.8 bad engine miss-nightmare!

2003 mustang engine miss approx.1500 rpm. so far we have installed plugs(plat),wires,cam sensor,crank sensor, imrc actuator,iac motor,fuel pressure reg.,fuel pump,filter,pulled the converter's(pipe),stii to no avail. when we pulled the intake manifold to replace the imrc, the intake was black with soot,except for the #6 cylinder port. this was as clean as new. ? we dipped the manifolds ,and are clean as new, don't have a clue anymore. the car still idles good,but stumbles bad at 1500 to 1800 rpm.pings bad also .sounds like #2 cylinder with exhaust system off.not sure of anything any more !!!!! anyone have any more suggestions? thanks , john

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post #2 of 7 (permalink) Old 01-21-2011
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coil pack, fuel injectors, bad compression.........


Red 1999 Cobra Vert:

316.6 rwhp @ 6093 rpms
318.1 rwtq @ 4489 rpms

On Just Bolt-Ons And Stock Exhaust Manifolds.

See Profile For Mods.......
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post #3 of 7 (permalink) Old 01-21-2011 Thread Starter
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new coil pack ,fuel injectors ck ok, compression 160 across:?:
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post #4 of 7 (permalink) Old 01-21-2011
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do you have any trouble codes?

2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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post #5 of 7 (permalink) Old 01-21-2011 Thread Starter
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did have a code for fuel pressure reg. changed the regulator, same problem. have valve cover off now , no sighs of wear anywhere. did originally, code for #2 miss fire
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post #6 of 7 (permalink) Old 01-22-2011
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timing chain? black in the bores should mean bad rings or warped cyclender, but compression is good?

exhaust blocked? a scantool and run a dianostic seeing the number may help

35th Anni. Laser Red 3.8 coupe
ET: 1/8-9.892 @71.57 ET: 1/4-15.452 @88.06
4.6 60' 2.195 ET 14.205 MPH 99.44

98 Ranger XLT 4x4 Oxford White 3.0 M/T
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post #7 of 7 (permalink) Old 01-25-2011 Thread Starter
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thanks for everybodys ideas and suggestions, still have the problem, going to change #2 injector one more time just for the hell of it. next is to reprogram the ecm . !!!!!!!!
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