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Showing results for tags 'lean run'.
Hi there folks, L28 with N42 head and block and stock EFI getting really rough warm up idle. Car fires right p but then rough until very warm. What helps greatly is if I unplug the vaccum hose from the FPR (also stock) which increases the fuel pressure to 40 psi. Then the car warms up without cutoff. Any ideas ? Ive tested all the connections per the Z fuel injection bible and everything checks out except the AFM which is slightly off. Ive checked fo vacuum leaks with smoke test and fixed two. Still same issue.