3/4ths Good ie missing
3/4ths Good ie missing
I can't seem to get the #1 cylinder to fire.
I have replaced the civi cap and rotor, set the timing, changed the plugs, even adjusted the valves.
The truck idles just fine but as soon as I put a load on it has much less power than it should. I can only make about 80KMH max. The valve cover for #1 never really gets as hot as the other three making me think this is the culprit.
Any thoughts?
I have replaced the civi cap and rotor, set the timing, changed the plugs, even adjusted the valves.
The truck idles just fine but as soon as I put a load on it has much less power than it should. I can only make about 80KMH max. The valve cover for #1 never really gets as hot as the other three making me think this is the culprit.
Any thoughts?
'74 710M Wrecked/Rolled
"The Worm"
'76 712M
718 Turbo Diesel
"The Worm"
'76 712M
718 Turbo Diesel
- audiocontr
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- Location: Buffalo NY
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you are going to have to isolate the cause of the problem, air,fuel,and spark are what is needed for combustion. Its obvious you have those otherwise the Pinz would not run at all and you stated you have it running at 80kph...I would first check for a strong spark to cylinder#1..if you have a good blue spark go to a compression check and a cylinder leakdown if compression looks good. Did this problem just occur? did it happen after a offroad trip? after fording a river? most of the time when something happens immediately after an event like previously mentioned it is electrical in nature and not mechanical.
life is like a box of chocolates...you never know which one you might get
710M
710M
I haven't done a compression check yes. The plug looked a little dark, maybe a little oily but not bad. Definitely not the nice gray of the other three. I need to check the wire/spark but it seems OK visually. ie no obvious cracks or worn spots on the insulation and the connections all seem good. I hope to put an Ohm meter on the wire after work today.
I believe it is electrical myself. This truck seems to have huge problems getting water in the dist cap. I have sealed it everywhere I know to, and in a driving rain it will always get wet!! I never had this kind of problem with my 710 in the same weather.
Thanks
I believe it is electrical myself. This truck seems to have huge problems getting water in the dist cap. I have sealed it everywhere I know to, and in a driving rain it will always get wet!! I never had this kind of problem with my 710 in the same weather.
Thanks
'74 710M Wrecked/Rolled
"The Worm"
'76 712M
718 Turbo Diesel
"The Worm"
'76 712M
718 Turbo Diesel
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- Posts: 322
- Joined: Mon Mar 22, 2010 3:07 pm
- Location: Middletown, New York
Ohm meter will test for wire reisitance and continuity, but I would be far more interested in sticking a screwdriver into the plug end of the wire and holding it close to a ground while cranking to see whether you are getting a good strong spark..unless you have test instuments to measure coil output. Do not assume because something is new or looks good...that it is...many parts are defective right out of the box..we had such an instance recently where one of the guys in my shop had a truck running badly after a tuneup..it ran fine before the tuneup...after some head scratching we closely inspected all parts and found the distributor cap terminal that was partially covered with a piece of plastic from the molding process causing that plug not to fire. Lesson learned start with the basics and go from there.
life is like a box of chocolates...you never know which one you might get
710M
710M
- audiocontr
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- Joined: Fri May 01, 2009 1:30 pm
- Location: Buffalo NY
Sounds like a cracked/worn plug wire to me. You can try swapping #1 with #2 and see if the problem swaps. I've also used a spray bottle in a dark garage. Spray the wires down and look for arcs.
I may or may not recommend the compression check. Sometimes its best to not know your compression and think the best. Aids in sleeping at night
I may or may not recommend the compression check. Sometimes its best to not know your compression and think the best. Aids in sleeping at night
I have to agree that I am not anxious to check compression!!
I have already made up a new set of plug wires and will probably try a new one on #1 and see what happens. it was suggested to try the Ohm meter and the spark.
I like the spray bottle idea!!
I have already made up a new set of plug wires and will probably try a new one on #1 and see what happens. it was suggested to try the Ohm meter and the spark.
I like the spray bottle idea!!
'74 710M Wrecked/Rolled
"The Worm"
'76 712M
718 Turbo Diesel
"The Worm"
'76 712M
718 Turbo Diesel
-
- Posts: 322
- Joined: Mon Mar 22, 2010 3:07 pm
- Location: Middletown, New York
- audiocontr
- Posts: 1868
- Joined: Fri May 01, 2009 1:30 pm
- Location: Buffalo NY
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Just to be clear on details:
You've got a civvy ignition set-up, and you've still got no spark on the #1 plug?
You've already replaced the cap & rotor (I assume because of this lack of spark on #1 ?).
All correct?
Can you take a known good plug wire, and a known good plug, and (by grounding the plug) get the #1 plug to spark? (perhaps you had a bad plug or wire, and replaced it with a new bad part.)
If you've got spark on 3 plugs, but no spark on just one, it seems unlikely to be a bad coil. I'd think the problem would be evident on all 4 plugs (poor burn, bad color, etc.).
If you've got a decent spark on #1, it might pay to re-check your valve adjustment on that cylinder. (Maybe you made a mistake on it the first time?)
What is the #1 plug's spark like?
You've got a civvy ignition set-up, and you've still got no spark on the #1 plug?
You've already replaced the cap & rotor (I assume because of this lack of spark on #1 ?).
All correct?
Can you take a known good plug wire, and a known good plug, and (by grounding the plug) get the #1 plug to spark? (perhaps you had a bad plug or wire, and replaced it with a new bad part.)
If you've got spark on 3 plugs, but no spark on just one, it seems unlikely to be a bad coil. I'd think the problem would be evident on all 4 plugs (poor burn, bad color, etc.).
If you've got a decent spark on #1, it might pay to re-check your valve adjustment on that cylinder. (Maybe you made a mistake on it the first time?)
What is the #1 plug's spark like?
Actually the only thing that makes me think #1 isn't firing is that the valve cover is not as hot as the other three. The truck will idle fine but will not get up to speed well and will only get up to about 55 MPH. It won't climb a hill and keep speed. In general it has no power.
I do have an exhaust leak at the manifold but I don't see how that could be contributing to this much loss of power. This truck has run 65 with 1900 pounds of steel in the back before.
I do have an exhaust leak at the manifold but I don't see how that could be contributing to this much loss of power. This truck has run 65 with 1900 pounds of steel in the back before.
'74 710M Wrecked/Rolled
"The Worm"
'76 712M
718 Turbo Diesel
"The Worm"
'76 712M
718 Turbo Diesel