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Re: So it is supposed to hunt?? Posted by Gary Stottler [Email]  (#1463) [Profile/Gallery]
(more from Gary Stottler) on Wed, 16 Feb 2011 21:30:18
In Reply to: So it is supposed to hunt??, Slyde, Wed, 16 Feb 2011 09:59:47 Members do not see ads below this line. - Help Keep This Site Online - Signup |
My inclination is always to go step-by-step through the original system and set all the bits right methodically and one at a time. The advice in the previous post was sound - first confirm that the base engine is sound (compression, leakdown, valve timing), then that the ignition timing is correct and that the vacuum advance/pressure retard work correctly. Then look at the fuel system. An early Lambda system (1978-1980) may "hunt" slightly at idle, but no more than +/- 25 rpm if everything mentioned above is good. You mentioned "big turbo" which makes me nervous - someone has been in there bastardizing the system which is almost never a recipe for good running. A fully functioning Lambda system with the sensor disconnected will not run very well - it defaults to a fixed ratio. Also I think that trying to graft on a later system will just lead you into a swamp of parts that don't fit, different calibration curves, etc. Your best bet is to make sure that your basic engine is sound and then work through the original Lambda system step-by-step to make sure each component and function is working properly. Beware the "big turbo" - how do you know that the stock fuel system can supply enough fuel to prevent the engine going lean under boost and melting expensive metal parts?
Best,
Gary Stottler
posted by 198.208.15...
_______________________________________ Gary Stottler
, Wed, 16 Feb 2011 21:30:18 <-- Viewing This Message, Fri, 18 Feb 2011 16:37:08
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