1984 dodge 1 ton 360 2wd P/u
4 barrel carb back fires every now and again, especially if I step on the gas peddle quickly to get moving.
I failed by .36 on carbon monoxide twice and rejected once for backfiring...
I've replaced all the fluids, plugs, wires and thermostat, and done the timing.
I starting overheating like crazy so I'm going to replace the water pump.
Would the truck heating up to much make the carb backfire and put out more gasses then normal???
Thx for all your help Anything that makes the engine run poorly is going to adversely effect the emissions. Take care of the overheating and the water pump alone if not leaking is probably not the problem. Check and or just flush out the cooling system and make sure fan clutch is good and radiator is good. It's old enough for about anything to be causing problems,
T
_________________________________________
Tom Greenleaf - MetroWest, Boston
http://acsource.net/acforum/index.php
COULD IT BE A BLOWN HEADGASKET??? Doing a memory search for this engine...................... sorry for the wait. I worked on a few of these with strange problems that were in cars MY around 1978 and they had some strange sludge build up under and in intake manifold that was hard to diagnose that caused problems. Head gaskets on these were tough. I think the EGR system may be at fault and timing chains can give up on these with some years and miles. The overheating needs to be addressed and fixed as that will cause problems overall.
The backfire could be hot spots in combustion area. Timing chain could be guessed with a couple tricks. Take a dwell reading and it shouldn't vary the timing by more than 5 degrees with advance disabled or just look at rotor in cap while turning crank. It shouldn't exceed 5 degrees either. Dwell will also be affected by worn distributor bearings.
The head gasket would probably show up as coolant in oil or loss of coolant out exhaust. Pressure testing cooling system and a compression test could be telling about that.
Do you have a good history on this engine and the maintenance over all these years? That could help. Keep in mind that 1984 is a tough year to nail folks for emissions as they weren't well engineered for the levels of just several years newer than that. Car makers were really scrambling to improve standards faster than technology could keep up at the time and that becomes an issue with that year into 1985 or untill they gave in to fuel injection,
T
_________________________________________
Tom Greenleaf - MetroWest, Boston
http://acsource.net/acforum/index.php
Car Repair | Car Diagnosis | Brake Repair | Transmission Repair | Trouble codes | car repair problems | auto insurance question | Car Logos Pictures |
4 barrel carb back fires every now and again, especially if I step on the gas peddle quickly to get moving.
I failed by .36 on carbon monoxide twice and rejected once for backfiring...
I've replaced all the fluids, plugs, wires and thermostat, and done the timing.
I starting overheating like crazy so I'm going to replace the water pump.
Would the truck heating up to much make the carb backfire and put out more gasses then normal???
Thx for all your help Anything that makes the engine run poorly is going to adversely effect the emissions. Take care of the overheating and the water pump alone if not leaking is probably not the problem. Check and or just flush out the cooling system and make sure fan clutch is good and radiator is good. It's old enough for about anything to be causing problems,
T
_________________________________________
Tom Greenleaf - MetroWest, Boston
http://acsource.net/acforum/index.php
COULD IT BE A BLOWN HEADGASKET??? Doing a memory search for this engine...................... sorry for the wait. I worked on a few of these with strange problems that were in cars MY around 1978 and they had some strange sludge build up under and in intake manifold that was hard to diagnose that caused problems. Head gaskets on these were tough. I think the EGR system may be at fault and timing chains can give up on these with some years and miles. The overheating needs to be addressed and fixed as that will cause problems overall.
The backfire could be hot spots in combustion area. Timing chain could be guessed with a couple tricks. Take a dwell reading and it shouldn't vary the timing by more than 5 degrees with advance disabled or just look at rotor in cap while turning crank. It shouldn't exceed 5 degrees either. Dwell will also be affected by worn distributor bearings.
The head gasket would probably show up as coolant in oil or loss of coolant out exhaust. Pressure testing cooling system and a compression test could be telling about that.
Do you have a good history on this engine and the maintenance over all these years? That could help. Keep in mind that 1984 is a tough year to nail folks for emissions as they weren't well engineered for the levels of just several years newer than that. Car makers were really scrambling to improve standards faster than technology could keep up at the time and that becomes an issue with that year into 1985 or untill they gave in to fuel injection,
T
_________________________________________
Tom Greenleaf - MetroWest, Boston
http://acsource.net/acforum/index.php
Car Repair | Car Diagnosis | Brake Repair | Transmission Repair | Trouble codes | car repair problems | auto insurance question | Car Logos Pictures |
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