White smoke related to short?
08-06-2009, 02:03 PM
#1
2nd Gear Member
Thread Starter
Join Date: Jul 2009
Location: NJ
Posts: 189
White smoke related to short?
Last week I replaced the alternator in my '89 GT, and since I was throwing in a 100-amp, I went ahead and replace the charge cable. I ran a big piece of heavy duty 2-0 cable behind the radiator clip, around the battery, over to the starter solenoid. I spliced in a big fuse link, which I bolted in between two large aluminum ring brackets (big mothers... machined L-shaped things that screwed onto the ends of the 2-0 cable).
In the last few days, I've noticed the following events.
1) Under load (clutch out) at low RPM in 2nd gear, a puff of white smoke as I came to a stop.
2) Radio has turned off briefly a few times
3) Headlights flickered the other night
4) Today at lunch, similar situation with white smoke (low RPM/2nd gear)
When I got back to work, I popped the hood to take a look. I noticed that the electrical tape I'd used to insulate the ring brackets and fuse link had been rubbing a bit on the frame, and had worn through. I poked the wire to make sure it wasn't touching the frame, and sure enough I saw a small spark (bad - this is near the battery).
I quickly wrapped the connection in a thick piece of rubber, which is all I could find to use. I plan to get some heater hose, or just some rubber hose and some friction tape or something tonight to really beef up the insulation on this spot.
Here's my big question: I've surmised that the electrical quirks were caused by this short, and I'm almost positive that I'm correct about that. The big mystery to me is the white smoke. My theory is that when the engine is at low RPM under load, there's more vibration, and the cable rubs the frame, shorting the positive battery terminal on the starter solenoid (and hence the ignition coil). It seems to me this would cause a misfire - does this seem like a sound theory?
I would like to avoid checking compression on all the cylinders, etc... If this seems plausible and I don't see the problem recur after I reinforce the cable, I'd like to just forget about it. Right now I have the nagging fear that it's something like a head gasket (although this seems unlikely to me).
The engine runs clean and well with no smoke or loss of power under all conditions except for those two instances of white smoke. If anyone has a thought or two on this, please chime in. Thanks.
In the last few days, I've noticed the following events.
1) Under load (clutch out) at low RPM in 2nd gear, a puff of white smoke as I came to a stop.
2) Radio has turned off briefly a few times
3) Headlights flickered the other night
4) Today at lunch, similar situation with white smoke (low RPM/2nd gear)
When I got back to work, I popped the hood to take a look. I noticed that the electrical tape I'd used to insulate the ring brackets and fuse link had been rubbing a bit on the frame, and had worn through. I poked the wire to make sure it wasn't touching the frame, and sure enough I saw a small spark (bad - this is near the battery).
I quickly wrapped the connection in a thick piece of rubber, which is all I could find to use. I plan to get some heater hose, or just some rubber hose and some friction tape or something tonight to really beef up the insulation on this spot.
Here's my big question: I've surmised that the electrical quirks were caused by this short, and I'm almost positive that I'm correct about that. The big mystery to me is the white smoke. My theory is that when the engine is at low RPM under load, there's more vibration, and the cable rubs the frame, shorting the positive battery terminal on the starter solenoid (and hence the ignition coil). It seems to me this would cause a misfire - does this seem like a sound theory?
I would like to avoid checking compression on all the cylinders, etc... If this seems plausible and I don't see the problem recur after I reinforce the cable, I'd like to just forget about it. Right now I have the nagging fear that it's something like a head gasket (although this seems unlikely to me).
The engine runs clean and well with no smoke or loss of power under all conditions except for those two instances of white smoke. If anyone has a thought or two on this, please chime in. Thanks.
08-06-2009, 02:15 PM
#4
2nd Gear Member
Thread Starter
Join Date: Jul 2009
Location: NJ
Posts: 189
I can take care of the problem if it's the short I found... planning to wrap it in friction tape, plastic conduit, or a short piece of heater hose later tonight... For now it's wrapped in a strip of 1/8" thick rubber.
08-06-2009, 02:16 PM
#5
5th Gear Member
Join Date: May 2007
Location: Pittsburgh
Posts: 2,459
He's handling the electrical...
What would make you say it is the clutch? It would have to be seriously raped hard to smoke, especially from the tailpipes. Not to mention he would smell the clutch and feel it slip if it were that bad.
What would make you say it is the clutch? It would have to be seriously raped hard to smoke, especially from the tailpipes. Not to mention he would smell the clutch and feel it slip if it were that bad.
08-06-2009, 02:19 PM
#6
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Join Date: Jul 2009
Location: NJ
Posts: 189
The clutch is a Ford Racing clutch, cable, & clutch quadrant and grips well.
The smoke did have a smell to it, something like partially burned gas maybe. Not burning oil or coolant as far as I can tell.
.
08-06-2009, 02:42 PM
#9
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Join Date: Jul 2009
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Posts: 189
08-06-2009, 02:50 PM
#10
I never use the engine to slow down. It is harder on brakes. I owned an isuzu trooper one time that would go through twice as much oil when using the motor to slow down. I got use to not using the engine. Driving through town I had to though. This thing had no brakes. I didn't even have the brake booster hooked up. lol