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post #1 of 11 (permalink) Old 02-29-2016, 05:46 PM Thread Starter
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Help Missfire

So I was given a 1995 tbird 4.6l six months ago and the previous owner said it has always had a misfire under load at low rpms and does it ever. I proceed to do all the normal stuff: plugs, wires, coil packs, fuel filters but the misfire wont go away. I go out and buy a code reader, it throws a P0304 code cylinder four. So, I check if the injector is getting power, it is, they all are. I then build a jig to bench test the injectors, they all work properly and are clean. In a last effort I change the intake gaskets and inspect the valve train, nothing i don't see any changes. Is this a common problem with tbirds?
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post #2 of 11 (permalink) Old 02-29-2016, 06:12 PM
No, Mr. Lemmywinks, No!!!

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The common problem for 94-95 cars is the EEC sticking an injector open, running gas out the tailpipe.

Check it with injector lights, and see if one isn't working.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
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post #3 of 11 (permalink) Old 03-01-2016, 01:24 PM Thread Starter
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Where would i get a new EEC?
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post #4 of 11 (permalink) Old 03-01-2016, 02:04 PM
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What did the spark plug look like on that cylinder?

Al

97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
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88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles
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post #5 of 11 (permalink) Old 03-01-2016, 02:59 PM Thread Starter
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If anything it looked lean but not very much
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post #6 of 11 (permalink) Old 03-01-2016, 05:39 PM
No, Mr. Lemmywinks, No!!!

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Was it wet with gas or oil?

You need three things to fire properly:

Air
Fuel
Spark

As the other plug is firing, this one is likely firing as well. Or it's shorted to ground, that will still run the other plug.

If you checked the injectors, and they work, and the injector test light says it's working, then air is the last thing to check.

Either there's a follower off one of #4's valves, or a valve is stuck open or something.
You need to yank the valvecover and look.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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Truth Isn't Truth. - Rudy Giuliani, 2018 Award winner, “Most Outrageous Diversion” by MSNBC for this quote
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post #7 of 11 (permalink) Old 03-01-2016, 07:32 PM Thread Starter
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If it was a valve problem it would miss all the time. This is why i am at a loss
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post #8 of 11 (permalink) Old 03-13-2016, 12:54 PM
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theres a hose under the intake that goes from the left to the right, sometimes it gets soft and sucks closed but ends up splinting on one end and causing vacuum leak. check that first before throwing more money at it.

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1994 Thunderbird, 4.6 V8, PI heads, SVO Blower, 8# pulley, 2.5 duel exhaust, 4R70W, MarkVIII converter, Mark VIII differential, Trac-Loc, 3.73 gears, H&R 1.5 lowering springs, bilstien rear shocks and SC front struts.
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post #9 of 11 (permalink) Old 03-13-2016, 04:42 PM
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Check your vacuum hoses. When I first got my car it had a P0304 and another misfire code. I checked the vacuum lines and the vacuum line/elbow from behind the plenum was badly cracked. Replacing it fixed that problem.
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post #10 of 11 (permalink) Old 03-15-2016, 04:50 PM Thread Starter
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I got a new ecu and the car ran great but now i have a p1405 code and it wont go above 2000 rpm and 30km\h please help
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post #11 of 11 (permalink) Old 03-15-2016, 09:41 PM
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Try a new DPFE sensor.

-Randy-
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