pulsating 383 engine
- Thread starter jct
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70bigblockdodge
Old Man with a Hat
Accelerating or steady cruise?
70bigblockdodge
Old Man with a Hat
Sounds like you have a lean condition, check for a vacuum leak.
Landyacht
Active Member
Might be a good idea to invest in a vacuum gauge and a can of starting fluid.
70bigblockdodge
Old Man with a Hat
If you have a propane torch like for plumbing solder, turn it on unlit wave it around all gaskets fittings ect. When the engine surges or runs better there is your leak.
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That's a good safe method for finding a vac leak.
commando1
Old Man with a Hat
Shouldn't he light a match to see into the gas tank first?
that's insurance fraud
i found that video that stated that on youtubers but he did it the unsafeway like a normal person would...
70bigblockdodge
Old Man with a Hat
So spraying highly flammable starting fluid or any other flammable liquid all over a hot engine is safe? If you manage to blow yourself up with a soldering torch you are a idiot.
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If you want to burn the car to the ground I would highly suggest spraying starting fluid at it. Forget about the fact that it probably makes for a decent paint stripper too.
Landyacht
Active Member
The starting fluid method will also help determine if there is worn or cracked insulation on your spark plug wires. Just remember to keep a pack of hotdogs on hand.
rkrochen
Senior Member
Mopar makes a combustion chamber cleaner that comes in a spray can. I works very well to detect leaks and is less volatile. Same procedure simply spray it around the areas that are susceptible to leaking and if the engine speeds up you have found it.
celticwarlock
Active Member
You can also cup your hands (palms down, of course) and put them over the throat if the carburetor, loosely at first, then more restrictively, to see how the motor responds. If the motor is sucking in air from somewhere else (as in the case of a vacuum leak), the idle will stabilize and/or increase. This will tell you whether or not you have a vacuum leak in the first place. Finding it afterwards should not be difficult with the carburetor cleaner method.
Landyacht
Active Member
I agree that using propane would be a much safer way to go but I've used starter fluid on numerous occasions to track down vacuum leaks and never started a fire or blew myself up. It is extremely unlikely that spraying ether on a hot engine surface will cause it to combust. The most likely causes of engine fires using this method would spraying starter fluid on a cracked distributor cap or plug wires with worn insulation or if you're doing this test on an engine that is backfiring and shooting flames out of the carburetor.
70bigblockdodge
Old Man with a Hat
Starting fluid is for mounting tires and moving dead F.I. cars that need pulled in garage for new fuel pump.
:campfire::fit:
:campfire::fit:
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