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Re: Won't run above 1500 RPM. Posted by RS [Email] ![]() ![]() ![]() In Reply to: Won't run above 1500 RPM., Garth, Tue, 11 May 2004 10:05:39 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First try changing the fuel pump relay. On my '89, its contacts for the fuel pump circuit badly pitted. When the contacts are pitted like that, the fuel pump may not be able to supply sufficient pressure to the fuel system because the voltage that reaches it may be too low.
If changing that relay doesn't make a difference, then it's the ECU.
Something very similar happened to my '89 SPG.
I didn't quite follow the scientific method (which is to test one hypothesis at a time, with the exception of changing the AMM, to see if that was the culprit). I swapped in an ECU from a '90 900S and changed the fuel pump relay at the same time. It started right up and has run perfectly ever since.
posted by 63.148.1...
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