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post #1 of 23 Old January 19th, 2015, 05:44 PM Thread Starter
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missfire help needed

ok, so I will start off by saying, this is in my Ranger. Next, this is the motor from my mustang. I recently swapped in the motor, and put a turbo coupe ecu with my quarterhorse in it. I am having a missfire problem that I can't solve. When I first put it together, it had a horrible missfire. I have done a few things that have made it less noticable, but I think it is just because it runs better, so the missfires aren't happening under as heavy a load. But I cannot get them to go away. Its not constant, or even predictable. Sometimes it does it bad at light throttle, sometimes under heavy accel. I'm lost, and ooking for guidance.

List of things done
New plugs, and regapped to ensure proper spark at .035".
New cap and rotor
Swapped out the coil with the good one from the car
Adjusted spark timing
Messed with the injector sizes in tuner
New oxygen sensor
I'm sure I forgot a few things, the only thing I haven't tried is new plug wires, but the ones I have are almost new, and have no damage anywhere.
Any ideas that might help, I'm all ears.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #2 of 23 Old January 22nd, 2015, 03:02 PM
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What year is that MIke?


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post #3 of 23 Old January 22nd, 2015, 04:26 PM Thread Starter
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87 auto tc ecu, repinned 89 ranger harness.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #4 of 23 Old January 22nd, 2015, 11:09 PM
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I'd go grab a fuel pressure gauge and watch the pressure as you drive, to eliminate that as a possibility.

Make sure the PCV and vacuum hoses aren't cracked somewhere.

Might want to put the stock injectors back in temporarily and go for a road test.

I assume you swapped the TPS all ready? Try unplugging it and see how it reacts.
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post #5 of 23 Old January 22nd, 2015, 11:46 PM Thread Starter
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Tps is the same one I had in the mustang, I took the whole motor.out, and swapped mounts then dropped it in the ranger. I do not have a set of the stock injectors, or I would have spread put them in. I'm considering a boport cam in the very near future, stage 1.5, and need to find some stock tc injectors. Also, the pcv has been eliminated, got a primitive draft tube style setup on it.

---------- Post added at 11:46 PM ---------- Previous post was at 11:43 PM ----------

Fuel pressure gauge isn't a bad idea, but I have the same setup that was in the car without this issue, and its got a better fuel pump than the mustang had. I'll give that a shot sometime. It also missfires at idle too, you can hear a stumble every once in a while.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #6 of 23 Old January 24th, 2015, 07:31 PM Thread Starter
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Update!

This is a preliminary update, as I'm not 100% sure its fixed. My egr tube has been cut off and welded shut. On the mustang I had the option to turn it off in the quarter horse. The ranger I didn't, but when I installed the motor I hooked it up. I was under the hood, and couldn't find and bad spark plug wires/loose connections so I unplugged the egr valve since I noticed it was plugged in. Then I left to go order spark plug wires and get gas. Well the whole trip it never missfired. So hopefully problem solved! I did still order the plug wires.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #7 of 23 Old January 25th, 2015, 05:12 PM Thread Starter
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Not solved... Damn.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #8 of 23 Old January 25th, 2015, 07:36 PM
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Since the issue seems to be intermittent, I'd suspect the issue to be electrically related. Are you running the Vane Air meter on that, or is it speed density? If it is running on the VAF, unplug it and note any changes.


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post #9 of 23 Old January 25th, 2015, 07:51 PM Thread Starter
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I am running the vam

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #10 of 23 Old January 26th, 2015, 06:51 AM Thread Starter
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Update, I have noticed it does it much less if I give the truck ~10 minutes to warm up before I drive it.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #11 of 23 Old January 26th, 2015, 07:42 PM Thread Starter
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OHC I changed the plug wires, still doing it, so I unplugged the vam, drove it, still there.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #12 of 23 Old January 26th, 2015, 10:02 PM
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Have you run it with the TPS unplugged?

Verified fuel PSI? If so, I would move to wire connections; grounds, shorts, etc.

Got a known "good" TFI module, try and swap that.

Where is this thing timed, try unplugging the spout and setting 22 degrees of advance. leave the spout unplugged.

Have you read the plugs? Rich or lean? Use your tuner.

Compare stock bin file with your current tune.

Re-post with update


TVS Supercharged SVO 2.7L

528 HP
561 ft lb
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post #13 of 23 Old January 27th, 2015, 06:54 AM Thread Starter
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Last time I checked the plugs they were a little black around the threads/shank but the electrode and ground strap looked like a solid stoich burn.

I am not sure on exact timing. I set it by ear, my timing light broke, so I set it and drove it, adjusted till I got spark knock, then slowly backed it off to the point where I only get spark knock under heavy load low rpm (4th or 5th gear, under ~1800 rpm)

I had the entire harness apart, i haven't found any bad wires or bad looking connections.

I have a graph of the tps signal, using the tuner i started a data record then slowly rolled on the throttle and slowly back off (automotive school training kicking in) and it looks good no bad spots i can see.


1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.

Last edited by Mikel89us; January 27th, 2015 at 09:47 AM.
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post #14 of 23 Old January 27th, 2015, 07:56 PM
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Have you changed PIP in distributor. Mine started out llike you described and became undrivable.
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post #15 of 23 Old January 27th, 2015, 10:33 PM Thread Starter
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I have not. I had considered something lime that, where did you get yours? I've never looked one up.

---------- Post added at 10:33 PM ---------- Previous post was at 10:31 PM ----------

I assume you mean the pickup inside the dist, not the module itself.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #16 of 23 Old January 31st, 2015, 02:21 PM
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Quote:
"Have you changed PIP in distributor"
I assume that you"re referring to the Hall effect sensor. PIP=Power IN Power or Profile ignition pickup

Mike don't you have a car you can pull a distributor from?


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post #17 of 23 Old January 31st, 2015, 05:44 PM Thread Starter
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I have another distributor, but its got a broken cap bolt. A lot of out stuff is the old vac advance stuff from racing.

I did buy the hall effect sensor, I haven't had a chance to install it yet, I also bought a shifter rebuild kit. Most of you wouldn't be familiar with how you rebuild a ranger shifter, lol.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.

Last edited by Mikel89us; January 31st, 2015 at 08:11 PM.
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post #18 of 23 Old February 2nd, 2015, 07:52 PM Thread Starter
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So the new pickup didn't do the trick. I think my next move is swapping the icm from the other distributor. If that doesn't work, I may need a set of stock tv fuel injectors. Anyone have a set or know where I might find a set?

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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post #19 of 23 Old February 12th, 2015, 10:43 PM
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Hey Mike, what kind of boost are you running in that setup?


TVS Supercharged SVO 2.7L

528 HP
561 ft lb
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post #20 of 23 Old February 13th, 2015, 10:11 AM Thread Starter
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NA right now, if I boost it, it will be 6 psi. Its got the 11:1 Cr motor from the mustang in it.

1991 Mustang LX 2.3L 5 Speed convert
1989 Ranger 4X4 2.5L 5 Speed solid Dana 30 front axle, 4.5" suspension lift, 3" body. ( blown up....)
Entire turbo kit waiting to be used again.
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