Quote:
Originally Posted by Mi59
My 1970 porsche-hard starting, doesn't idle, runs real rough, miss fires, etc...until the engine reaches 4,000 rpm's.
At 4,000 rpm's the engine runs smooth, climbs in rpm's rapidly and has good performance. It has a complete tune-up, went over the ignitions system several times, checked and adjusted valves( which seem to be normal). It was pointed into me that the timing chain tensioners are a known problem and could be the cause of the problem I have. I removed the timing covers and noticed the standard tensioners are in place and they look original. Open to any solutions on how to fix this problem are greatly appreciated.
|
I would look to issues with the carburetors. The original carbs were Zeniths and the air by pass system for smog control often malfunctions.