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Dishonest Mechanic? I went to a mechanic for a tune up on my Chevy Muscle car. It has a rebuilt 383 Stroker 8 cylinder. It was running a little rick, had some run on. This mechanic identified needing larger exhaust pipes so I did this with replacing the plugs, distributer cap, rotor, spark plugs. My Holly 4 barral Street Avenger Carb was rebuilt. he also repaired a small vacuum issue and the drivers sideheader gasket. A new power valve was put in(carb). I was told the car was finish, that it was running great and to come pick it up. I got there and when I went to start the car it was a little sluggish to warm up and the idle kept falling off..The mechanic looked puzzled then checked the timing again. When my flex fan kicked on it triggered the idle to drop. After a vacuum test it was diagnosed that the power valve was too small in the Carb...Had it changed out..still idled poorly. Was diagnosed with a bad MSD ignition Box...had it replaced, still had an idle problem...finally a leak down test was done and I was shown that I had 4 bad cylinders: Cylinder 3-40%, Cylinder2-30%, cylinder4 35%, Cylinder6-20%....I changed the oil every 3k miles(30k total on engine). The mechanic said that I needed to rebuild this engine, I was in shock. I only used Cheveron High test gas. I had no Idle problem before the tune up. The car ran well. I pulled the car from the mechanic saying I wanted a second opinion. I drove the car 7 miles home, it ran very well, started well, no smoke from the exhaust. The idle is high @ 1000rpm, was at 750RPM. There is no run on...What do you is a little tight, did this mechanic try to sell me a needless engine overhaul? Should I bring it to another mechanic to look it over?

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  • Edward Fazio Apr 29, 2013

    The engine was rebuilt, 4 years ago. The bugs were worked out 2 years ago. I never really drove the car hard. It has scary power. I push it only occassionally. Has never been on a track. The mechanic in question said that the car was running too lean for too long and this is what caused the excessive wear. This doesn't make sense either.

  • Edward Fazio Apr 29, 2013

    I was thinking of using the Risolene 8 cylinder restore additive. To free up the rings a little and help with loss of compression but I am concerned that it will do more harm than good.

  • Edward Fazio Nov 02, 2016

    After all this analytical going over...turns out the carburator was damaged during the rebuilding by the mechanic and I needed new spark plug wires. the mechanic swore it wasn t the carb, he lied. i put a new racing Holly carb and new wires and the car ran 85% better.


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If you have a muscle car, it would be a good age. unless you have owned it from new, you don't know how it has been looked after before you got it. When you do a tune up it can highlight problems that you haven't noticed because the state of tune was hiding the problem. Also running expensive oil through an engine with an unknown history can create problems rather than prevent them. The stroker engine is a fairly high revving motor and as such is open to abuse. And the fact it is a muscle car will mean it will have been used as such. I would suggest you buy a second motor and recondition that while running the one in your car. As long as you can live with the motor you have got. You could take your time and do the work yourself. I don't think the mechanic was trying to rip you off. He just found problems that were already there, but hidden.

Posted on Apr 29, 2013

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SOURCE: 2001 Galant ES-V6 DTC is P0304 - Cylinder #4 misfire

look for weak valve springs.

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I suggest a second opinion would be in order as everything he did for the tune up was not altogether necessary. I consider that as the car was running ok before I would not touch the carby other than to fine tune the idle mixture to emission requirements. Any problems with the distributor cap would have showed up as a miss and the rotor button would have to be really bad but again as it was running ok. My policy is don't touch what ain't broke.Power valves in carbys are there to give extra fuel when the vacuum falls off under acceleration and do nothing else. To accommodate a bigger alternator more adjustment on the idle mixture screw would be necessary at idle but as alternator barely charge at idle the adjustment would be little. The low compressions may be from pumped up hydraulic followers and I would discuss that with the original engine builder as to what hydraulic units he fitted. but again if it was running ok before what the hell. Yes get a second opinion for sure from the engine builder.

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