Engine sputtering wont start - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 09-11-2019, 08:40 PM Thread Starter
 
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Engine sputtering wont start

Hi Guys,
I have a 1967 Lemans that have spent 6 years restoring and have been driving for 2 years since completed. Had the Quadrajet carburetor rebuilt last year. Has been running great until yesterday. While driving it starting stuttering and stalled so had it towed back home. Started it up the next day and ran great for 5 minutes then started stuttering again and now will not even start. It fires but will not start. what I have done to troubleshoot the problem so far is change the gas filter and confirm that it is getting gas when depressing the throttle which it is. Unfortunately I am weak when it comes to engine troubleshooting skills and have not had to do to much with it since restoring it. I could take it to the local garage but part of the fun of owning one these cars is being able to maintain it. I am hoping someone can give me some tips as to how i should go about troubleshooting this problem.
Any advice would be great and would like to mention this website has been a great source of information during my restoration years.
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post #2 of 12 (permalink) Old 09-11-2019, 09:13 PM
 
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Originally Posted by RM9700 View Post
Hi Guys,
I have a 1967 Lemans that have spent 6 years restoring and have been driving for 2 years since completed. Had the Quadrajet carburetor rebuilt last year. Has been running great until yesterday. While driving it starting stuttering and stalled so had it towed back home. Started it up the next day and ran great for 5 minutes then started stuttering again and now will not even start. It fires but will not start. what I have done to troubleshoot the problem so far is change the gas filter and confirm that it is getting gas when depressing the throttle which it is. Unfortunately I am weak when it comes to engine troubleshooting skills and have not had to do to much with it since restoring it. I could take it to the local garage but part of the fun of owning one these cars is being able to maintain it. I am hoping someone can give me some tips as to how i should go about troubleshooting this problem.
Any advice would be great and would like to mention this website has been a great source of information during my restoration years.
"It fires but will no start" What does that mean? That it has spark at the plug wires? Does it have spark at the end of the plug wires when held close to metal while cranking?
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post #3 of 12 (permalink) Old 09-11-2019, 10:07 PM
 
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https://www.amazon.com/ENA-Universal...56637262&psc=1

one of these is very handy .....
it blinks with every spark on that plug wire ...
it doesnt tell how strong ... but if you do or dont... are they dry ? wet ? black ? orange?

pull a couple spark plugs "1" at a time.
it takes ..air , spark, fuel , and compression = to make an engine a possible runner

I wish you the best .... sounds similar to water in the gas ... did you recently fill up ??

Last edited by BLK69JUDGE; 09-12-2019 at 10:36 AM.
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post #4 of 12 (permalink) Old 09-12-2019, 10:19 AM Thread Starter
 
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In response to RMTZ67 when i say "It fires but will no start" would mean it will run for 2 seconds then stalls. it will do this continuously but never stay running. I assume it has spark based on the fact that it will run for a couple of seconds but will test for spark at each spark plug once i have someone to turn the ignition for me.
In response to BLK69 JUDGE, Yes I did recently fill up the gas tank just 2 days before the problem occurred. If there is water causing the problem should i try using something like Iso heet which helps displace the water and if that doesnt work drain the gas tank to rule that out as being the problem. As I mentioned I am not very good with engine mechanics and so can you clarify what you mean When you say "air spark fuel and compression = possible runner".
I plan on getting the inline spark checker today. seems like a handy tool to have for quick testing.

Thanks to both of you for the quick response

Today I drained gas line,replaced inline gas filter, pulled each spark plug,cleaned them and blew out cylinder's with air hose. seemed to be a lot of fluid in the cylinders I am guessing flooded with gas. After that the car started up and run for about a minute then started stalling again.

Last edited by RM9700; 09-12-2019 at 05:36 PM.
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post #5 of 12 (permalink) Old 09-12-2019, 05:44 PM
 
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Originally Posted by RM9700 View Post
In response to RMTZ67 when i say "It fires but will no start" would mean it will run for 2 seconds then stalls. it will do this continuously but never stay running. I assume it has spark based on the fact that it will run for a couple of seconds but will test for spark at each spark plug once i have someone to turn the ignition for me.
In response to BLK69 JUDGE, Yes I did recently fill up the gas tank just 2 days before the problem occurred. If there is water causing the problem should i try using something like Iso heet which helps displace the water and if that doesnt work drain the gas tank to rule that out as being the problem. As I mentioned I am not very good with engine mechanics and so can you clarify what you mean When you say "air spark fuel and compression = possible runner".
I plan on getting the inline spark checker today. seems like a handy tool to have for quick testing.

Thanks to both of you for the quick response

Today I drained gas line,replaced inline gas filter, pulled each spark plug,cleaned them and blew out cylinder's with air hose. seemed to be a lot of fluid in the cylinders I am guessing flooded with gas. After that the car started up and run for about a minute then started stalling again.

Sounds like it may indeed be flooding - carb problem.
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post #6 of 12 (permalink) Old 09-12-2019, 07:58 PM Thread Starter
 
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When checking the Carb after stalling It looks like the gaskets are wet from gas? I am a little Leary about pulling the carb off and inspecting it but not afraid to try. I have the Cliff Ruggles book on how to rebuild and modify Quadrajet Carburetors which should be helpful. I was able to slip a flat plastic tip in from the top of the carb and the float does move up and down.
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post #7 of 12 (permalink) Old 09-13-2019, 04:15 PM Thread Starter
 
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I pulled the carb off today and took it apart. not completely but enough to check for anything that would cause the float to stick or something that would look out of place. One thing i noticed is all the bolts and screws didn't seem to be very tight and was hoping that may have been part of the problem. after reinstalling the carb the problem is still there. Runs for a few seconds then stalls. If i rev it up and maintain high rpm's it will stay running for a short time. Now i am at the point of replacing things like the fuel pump which I have never changed during the restoration.
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post #8 of 12 (permalink) Old 09-14-2019, 02:27 AM
 
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If it's flooding that much the exhaust would be spewing a lot of BLACK smoke. After it stalls, quickly look down the carb with a flashlight and see if you see fuel still leaking in. That would show too much fuel is getting in and you have a float or needle problem and a fuel pump is not your problem, you may be getting too much gas.

You could try some starting fluid. Have a friend start it and you be ready at the carb to shoot some in and see if you can keep the engine running. If you can, then it would be too little fuel or a pump or carb problem.
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post #9 of 12 (permalink) Old 09-26-2019, 07:46 PM Thread Starter
 
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Took the carb off again, removed float, main jets, and cleaned everything. I am not an expert on these carbs but didnt see anything that would be a problem. I set the mains jets initially at 2 1/2 turns out after putting it back on. the manifold gasket didnt look bad so reused it which may have been a mistake. I also swapped out the fuel pump, distributor cap and rotor. I am getting spark at the plugs. confirmed both coil and voltage regulator are within specs. Had it running good once for about 10 minutes then suddenly shut down.
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post #10 of 12 (permalink) Old 09-26-2019, 07:57 PM
 
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Sounds like it is flooding, can you just lean out the mixture a bit, turn it in to 2 1/4.....then 2.....can you get it to run there?

Floats set too high can cause flooding as well...
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

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