Pulling hair out. . . .please help
Freshman User
Joined: Sep 2006
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Hey ya Dirty. I have this exact same problem,as well as the pulling hair out.without the smoke
I have replaced my ignition coil as well as FPR,timing is good O2 sens. & all the other junk because i have had no engine codes in any of the key positions. and to no effect. Still does it,as well as lossing alota power after driving on the express way for a few miles. This sputtering problem, when fixed, I belive would cure my other problem...for now
Originally Posted by kernel-panic
Sounds kind of silly, but you may want to check your ignition coil "cold" and "hot". Sounds like it could be going bad.
Last edited by wick972; Feb 6, 2007 at 04:09 PM.
Posting Guru
Joined: Sep 2004
Posts: 1,915
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From: Yokosuka, Honshu, Japan
I forgot about the IAC. Could be dirty or going bad or the actual valve is gunked up, as well as the throttle body and the upper intake. I think this issue was one of the reasons why they got rid of the EGR in '89 on these engines. Could be the ECC or any one of the relays associated with the ECC or fuel delivery. This is definitely a frustrating problem. I have a similar situation, but mostly when the engine is still cold and only at part throttle. It's just been too darn cold out lately to mess with it much. I froze my tush off this past weekend doing oil changes as it is! Would be nice to have a heated garage!
Senior User
Joined: May 2005
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From: YORK S.C.
wonder if the problem is in one of the connectors on the wiring harness for the injectors?? not completly plugged in or shorting to ground? everything else has been replaced,so there isn't much let except for the wiring
Freshman User
Joined: Feb 2007
Posts: 37
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From: Connecticut Shoreline
I had the vacuum line fall off the MAP sensor on my 1988 Taurus.
It was producing black smoke and was getting poor milage.
I would't drive it much more if it's smoking black as you're producing
alot of carbon and washing the oil off the cylinders.
It was producing black smoke and was getting poor milage.
I would't drive it much more if it's smoking black as you're producing
alot of carbon and washing the oil off the cylinders.
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Senior User
Joined: Dec 2004
Posts: 244
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From: Michigan
Well Today I replaced the IAC and the Hose going to the MAP sensor, mainly because it was 2 degrees out side and it simply broke. As of now the only thing i haven't replaced is the knock sensor.
Here is the thing ALL of the wiring under the hood is original to the truck. None of it is from the other one. Both trucks had a 2.9 the only difference is my new one had an automatic in it and it broke so i replaced it. All of my wiring connectors have been taken apart and packed with dielectric Grease so i know I'm getting a good connection.
And i noticed today that it does it mainly when it is cold but it will do it a little when it warms up.
Also right now I'm not getting any black smoke due to the fact that i have a full exhaust on this truck. the only reason i knew i was getting black smoke out the tail pipe is because i just had a punched out cat for an exhaust on my other truck and I'm getting the same symptoms.
Here is the thing ALL of the wiring under the hood is original to the truck. None of it is from the other one. Both trucks had a 2.9 the only difference is my new one had an automatic in it and it broke so i replaced it. All of my wiring connectors have been taken apart and packed with dielectric Grease so i know I'm getting a good connection.
And i noticed today that it does it mainly when it is cold but it will do it a little when it warms up.
Also right now I'm not getting any black smoke due to the fact that i have a full exhaust on this truck. the only reason i knew i was getting black smoke out the tail pipe is because i just had a punched out cat for an exhaust on my other truck and I'm getting the same symptoms.
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Senior User
Joined: Dec 2004
Posts: 244
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From: Michigan
I have the studied the wiring diagrams and have found the EEC has nothing to do with the transmission. the 2 plugs on the A4LD transmission are back up lights and the PRNDL Switch other than those 2 the transmission is a vacuum operated.
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Posting Guru
Joined: Sep 2004
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From: Yokosuka, Honshu, Japan
Postmaster
Joined: Dec 2001
Posts: 3,742
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From: UT
The differences between and automatic and manual computer wouldn't create the problem we're seeing. The automatic computer is set up to the torque converter lockup clutch (and the 3-4 shift if '88+). Nothing that would cause the computer to fault rich like we're seeing.
If the thermostat were stuck open so the engine didn't warm up like it should, the computer would constantly run in "warm-up" mode. It would run a little rich, but I don't know that it would run bad. I've put a voltmeter across the ECT and monitored the voltage drop to see what the engine temperature is actually doing. If the engine is warming up above 180 F, I would expect the thermostat is not contributing to the issue.
When you went through all the wiring, did that include grounds? A bad ground to the computer can have a lot of consequences. For that matter, an intermittent engine block ground could interfere with the spark plugs firing.
At this point, I don't know that the problem is in the EEC-IV/engine management system. You've replaced a lot of the sensors, and the problem migrated with the engine block when you moved it.
What do you get from a compression test? All cylinders firing?
If the thermostat were stuck open so the engine didn't warm up like it should, the computer would constantly run in "warm-up" mode. It would run a little rich, but I don't know that it would run bad. I've put a voltmeter across the ECT and monitored the voltage drop to see what the engine temperature is actually doing. If the engine is warming up above 180 F, I would expect the thermostat is not contributing to the issue.
When you went through all the wiring, did that include grounds? A bad ground to the computer can have a lot of consequences. For that matter, an intermittent engine block ground could interfere with the spark plugs firing.
At this point, I don't know that the problem is in the EEC-IV/engine management system. You've replaced a lot of the sensors, and the problem migrated with the engine block when you moved it.
What do you get from a compression test? All cylinders firing?
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Senior User
Joined: Dec 2004
Posts: 244
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From: Michigan
The Engine is brand new. I rebuilt it my self, and before any one out there doubts my skills I DO know how to rebuild engines I have rebuild a lot of engines so there is nothing wrong with the way i did it.
The only sensor i HAVE NOT replaced is the knock sensor, or what ever that sensor is on the side of the block on the drivers side under the manifold.
As for a intermittent ground fault, i have a ground strap running from the battery to the block and another one running from the chassis to the battery. and when i installed the engine i cleaned the surface where the ground was going to be installed.
I changed the computer to the correct one today, no surprise it had NO effect on the problem.
mrshorty I'll try to move the ground to a different location and see if that changes anything.
And for all of you who think I'm spending a lot for this, I'm not. I have used parts that are known to be good or have just come off of the old engine.
The only sensor i HAVE NOT replaced is the knock sensor, or what ever that sensor is on the side of the block on the drivers side under the manifold.
As for a intermittent ground fault, i have a ground strap running from the battery to the block and another one running from the chassis to the battery. and when i installed the engine i cleaned the surface where the ground was going to be installed.
I changed the computer to the correct one today, no surprise it had NO effect on the problem.
mrshorty I'll try to move the ground to a different location and see if that changes anything.
And for all of you who think I'm spending a lot for this, I'm not. I have used parts that are known to be good or have just come off of the old engine.
Last edited by dirtybroncoii; Feb 9, 2007 at 07:08 PM.
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From: Yokosuka, Honshu, Japan
Originally Posted by dirtybroncoii
Also right now I'm not getting any black smoke due to the fact that i have a full exhaust on this truck. the only reason i knew i was getting black smoke out the tail pipe is because i just had a punched out cat for an exhaust on my other truck and I'm getting the same symptoms.
Postmaster
Joined: Dec 2001
Posts: 3,742
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From: UT
As for a intermittent ground fault, i have a ground strap running from the battery to the block and another one running from the chassis to the battery. and when i installed the engine i cleaned the surface where the ground was going to be installed.
Posting Guru
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From: Yokosuka, Honshu, Japan
I believe it's the one "fused" wire coming off the stock negative battery cable that goes to the computer... so, 1 wire to the battery from the computer, 2 to body / frame, I believe. I haven't looked at mine in a while, either, but I believe that's what it is.