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#6804460 - 06/26/17 09:25 AM Is there a mechanic in the house?
Wilhunt Online   content
Veteran Tracker

Registered: 07/26/13
Posts: 3324
Loc: New Braunfels, San Saba county
1976 jeep 4.2 six cylinder.
Developed a bad miss and loss of power. Put In new spark plugs and wires, new ignition module and had already put in a rotor. Did not really help much, developed a spitting noise from exhaust made me think of a burned valve. Did a compression check both wet and dry and the compression was good.
Put in a new distributor cap and reinstalled plugs that had got wet in rain. Before install of plugs, tried to dry them and sprayed NON FLAMABLE brake cleaner in to each plug to dry and clean. Did not realize the brake cleaner was not flammable until later. The jeep ran slightly better but still had a miss.
Disconnected battery ground cable from block and cleaned the ends as well as putting some electric tape where worn insulation was missing. Jeep ran much better but still has miss in it at idle, miss seems to be less at high rpm. Though it is running better I have a constant blue smoke from exhaust...it has never burned oil and have never had to add oil. When I checked wet compression, I put 4 squirts of oil in each cylinder.
Plan is to put a new ground cable on being as I did get good results when I cleaned it. Carburetor is not the best but I don't think that would produce the blue smoke.

Questions, how long should it take for the oil I put in each cylinder to be gone? Do you think the plugs that got wet should be replaced even though I put them in a short time ago?
Any comments will be appreciated very much. Sorry for the long post.

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#6804519 - 06/26/17 10:14 AM Re: Is there a mechanic in the house? [Re: Wilhunt]
Cast Offline
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Registered: 12/14/08
Posts: 16462
Loc: North Texas - God's Country
Pull plugs and turn it over a few times to blow it out. Use new plugs and gap them correctly. Double check the ignition wires. Blue smoke is oil, black smoke is gas, white smoke is water. I would test the spark at each plug prior to installing. You're wanting a bright blue spark. For full ignition test, open up an old plug gap to 1/4" and test it for spark to each ignition wire. A good ignition system will jump the 1/4" gap. I'd screw in the plugs before you do the 1/4" spark test to prevent a fireball or four.

Be careful making sparks over an open live cylinder spraying gas. We don't wanna change your nickname to Smokey.
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Cast



I have a short attention spa

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#6804616 - 06/26/17 11:40 AM Re: Is there a mechanic in the house? [Re: Wilhunt]
TEXASLEFTY Online   content
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Registered: 10/26/07
Posts: 8766
Loc: The Island Cres
Plug wires? A miss at idle and not at above 2000 rpms is typically ignition.

Even though somebody always tells me I'm wrong on these threads, I've been a mechanic for 28 years...
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Originally Posted By: Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.

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#6804725 - 06/26/17 12:42 PM Re: Is there a mechanic in the house? [Re: TEXASLEFTY]
Wilhunt Online   content
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Registered: 07/26/13
Posts: 3324
Loc: New Braunfels, San Saba county
Originally Posted By: TEXASLEFTY
Plug wires? A miss at idle and not at above 2000 rpms is typically ignition.

Even though somebody always tells me I'm wrong on these threads, I've been a mechanic for 28 years...

Have new wires, dist cap, coil and ignition module. Will double check spark plugs. if that is not it what might you suggest I check?

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#6804727 - 06/26/17 12:43 PM Re: Is there a mechanic in the house? [Re: Cast]
Wilhunt Online   content
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Registered: 07/26/13
Posts: 3324
Loc: New Braunfels, San Saba county
Originally Posted By: Cast
Pull plugs and turn it over a few times to blow it out. Use new plugs and gap them correctly. Double check the ignition wires. Blue smoke is oil, black smoke is gas, white smoke is water. I would test the spark at each plug prior to installing. You're wanting a bright blue spark. For full ignition test, open up an old plug gap to 1/4" and test it for spark to each ignition wire. A good ignition system will jump the 1/4" gap. I'd screw in the plugs before you do the 1/4" spark test to prevent a fireball or four.

Be careful making sparks over an open live cylinder spraying gas. We don't wanna change your nickname to Smokey.


Thanks Cast I will follow up on the spark with new plugs.


Edited by Wilhunt (06/26/17 12:44 PM)
Edit Reason: sp

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#6804803 - 06/26/17 01:42 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
TEXASLEFTY Online   content
THF Trophy Hunter

Registered: 10/26/07
Posts: 8766
Loc: The Island Cres
Timing.
_________________________
Originally Posted By: Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.

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#6804808 - 06/26/17 01:45 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
TEXASLEFTY Online   content
THF Trophy Hunter

Registered: 10/26/07
Posts: 8766
Loc: The Island Cres
The cam and crank have Absolutely got to be in time. That's my next guess besides a bad distributor. Does it have eltronic ignition, I'm not an expert on anything much less keeps but... a 1976 could have bad points. When was the last time it ran right?
_________________________
Originally Posted By: Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.

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#6804810 - 06/26/17 01:45 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
TEXASLEFTY Online   content
THF Trophy Hunter

Registered: 10/26/07
Posts: 8766
Loc: The Island Cres
Jeeps not keeps
_________________________
Originally Posted By: Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.

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#6805115 - 06/26/17 06:46 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
Wilhunt Online   content
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Registered: 07/26/13
Posts: 3324
Loc: New Braunfels, San Saba county
Texas Lefty I have changed the distributor cap and yes it does have the electronic ignition. Also put in a new ignition module. I did turn the distributor slightly in both directions and did not seem to make a difference. I put a new rotor in not long aqo when this first started. Under the rotor and on top of the distributor, there is a rubber piece. not thick and I don't know it's purpose. In any case it has a cut on it about half inch long. Does that mean anything?
I know on some of the older chevy's they would develop oil leaks via the valve guides. This engine is in the AMC family...do the AMC engines have this same valve guide problem?

Thank you for your time!

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#6805367 - 06/26/17 09:12 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
TEXASLEFTY Online   content
THF Trophy Hunter

Registered: 10/26/07
Posts: 8766
Loc: The Island Cres
If it smokes at idle after start up it's probably not the valve seals or guides. Typically smoke at idle is rings. If it has electronic ignition the distributor is probably not stock. I'm not sure about the rubber piece inside the distributor.

If it were my Jeep I would not be worried about burning a little oil. The problem your describing certainly sounds like an ignition problem to me. If you've never replaced the distributor and your 100% sure that it's in time then... with out even seeing the Jeep (just guessing) sounds like a distributor problem. I would be checking actual voltage and continuity to ground at the distributor also
_________________________
Originally Posted By: Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.

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#6805443 - 06/26/17 09:59 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
Wilhunt Online   content
Veteran Tracker

Registered: 07/26/13
Posts: 3324
Loc: New Braunfels, San Saba county
Wet compression was as follows,
Cylinder 1- 149,
2- 149
3- 148
4- 149
5- 151
6- 152
I thought this would eliminate rings being bad, perhaps not. Will check voltage and continuity next week-end. Thank you!

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#6806077 - 06/27/17 01:30 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
TEXASLEFTY Online   content
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Registered: 10/26/07
Posts: 8766
Loc: The Island Cres
Again, it's not easy too troubleshoot thru the forum.

The compression is not super important at this point, I'm glad to see it's all about the same which tells me compression is not causing the felt missfire.

Like I've already stated Ignition.
_________________________
Originally Posted By: Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.

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#6806179 - 06/27/17 03:01 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
Cast Offline
THF Celebrity

Registered: 12/14/08
Posts: 16462
Loc: North Texas - God's Country
Do the 1/4" spark test on all plug wires and get back to us. What's next if that flies Lefty?
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Cast



I have a short attention spa

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#6806246 - 06/27/17 04:12 PM Re: Is there a mechanic in the house? [Re: Wilhunt]
CharlieCTx Online   content
Pro Tracker

Registered: 05/27/13
Posts: 1393
Loc: Flower Mound, TX
How about start it and pull one wire at a time? If it doesn't stumble when pulled that could help ID a bad wire.

Does it have a stock exhaust manifold or header? If it has a header, after fresh/cold start, check temp on each header tube for one that is cooler than the others (not firing and/or not firing regularly). You can use a grease pencil, candle, drops of water, etc.

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Charlie

M&P-10+AAC Cyclone - Kel-Tec RFB+Griffin Sportsman Ultra Light 300
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#6806358 - 06/27/17 06:17 PM Re: Is there a mechanic in the house? [Re: CharlieCTx]
TEXASLEFTY Online   content
THF Trophy Hunter

Registered: 10/26/07
Posts: 8766
Loc: The Island Cres
Originally Posted By: CharlieCTx
How about start it and pull one wire at a time? If it doesn't stumble when pulled that could help ID a bad wire.

Does it have a stock exhaust manifold or header? If it has a header, after fresh/cold start, check temp on each header tube for one that is cooler than the others (not firing and/or not firing regularly). You can use a grease pencil, candle, drops of water, etc.



Good simple advice.
_________________________
Originally Posted By: Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.

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