tbm3fan
Old Man with a Hat
Things cannot be that hard when it comes to tuning a Mopar 360 could they? I have no trouble with all the Ford engines but the 360 denies me.
Today I went to take it out for a drive. Noticed that the engine had a subtle surge and at times a subtle stumble. Felt the slight surge when on the freeway at 65mph. Felt surge and stumble when at a stop light which had me keep my foot on the gas. Did get home ok.
Pulled out my tools to take a look. Checked all vacuum lines as first order in case any off. No, they were all on and being replaced two years ago all good. Hook up vacuum gauge and timing light. First thing I notice is the vacuum is at 15mm and bouncing about 2mm. You can see, hear and feel the engine surge and then stumble back before starting it all over again. Checking timing and don't see a damn thing. The marks had been detailed out every 10 degrees and they were nowhere to found. Whatever.
So I loosened the distributor and moved it to tune by vacuum. Highest vacuum was reached at 20mm. Still no timing marks and the vacuum gauge bounced between 19-21. Still could see the engine bounce back and forth, feel it in the body, and hear it via the fan speed as rpm varied. The idle mixture screws were already at highest vacuum while idle speed close to 900-1000. If at 750, as called for, the engine died when in drive eventually. Anyway called it a day to think on it for awhile.
Today I went to take it out for a drive. Noticed that the engine had a subtle surge and at times a subtle stumble. Felt the slight surge when on the freeway at 65mph. Felt surge and stumble when at a stop light which had me keep my foot on the gas. Did get home ok.
Pulled out my tools to take a look. Checked all vacuum lines as first order in case any off. No, they were all on and being replaced two years ago all good. Hook up vacuum gauge and timing light. First thing I notice is the vacuum is at 15mm and bouncing about 2mm. You can see, hear and feel the engine surge and then stumble back before starting it all over again. Checking timing and don't see a damn thing. The marks had been detailed out every 10 degrees and they were nowhere to found. Whatever.
So I loosened the distributor and moved it to tune by vacuum. Highest vacuum was reached at 20mm. Still no timing marks and the vacuum gauge bounced between 19-21. Still could see the engine bounce back and forth, feel it in the body, and hear it via the fan speed as rpm varied. The idle mixture screws were already at highest vacuum while idle speed close to 900-1000. If at 750, as called for, the engine died when in drive eventually. Anyway called it a day to think on it for awhile.