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  Mustangsandmore Forum Archive
  '69 to '73 -- The Musclecar Mustang
  High Speed Surging

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Author Topic:   High Speed Surging

Posts: 54
From: Palmyra, MO, United States
Registered: Jun 2005

posted 11-03-2006 03:59 PM     Click Here to See the Profile for traumastang        Reply w/Quote
Hi all,

I have had my '73 Mach 1 running for almost a year now after a complete engine rebuild (351 Cleveland with vefry mild cam put in). After about 1000 miles I noticed I was getting some dieseling after turning the car off. I took it to a mechanic to reset the timing and readjust the carb (was rebuilt at the same time the engine was/original carb). He adjusted the timing he said, which fixed the deiseling but then I noticed it had a tremendous loss of power. I took it took work one night and opened it up on the highway. It was then I noticed it would start to surge really bad (almost like it was starving for gas) at around 90-100mph, which it did not do before.

I took it to an older mechanic who is regionally well known for being an excellent carb man. He said they retarded the timing too much and it was "2 teeth off" on the timing. It starts much better now, idles better, but I still notice the surging at high speeds as well as a slight hesitation when I do hard acceleration. It ahs its power back but the surging is concerning to me.

Any ideas what should be my next move?



Posts: 48752
From: Saco, Maine
Registered: May 99

posted 11-04-2006 08:08 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
Sounds like a weak fuel pump, if the float level in the carb is correct.

'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

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