Drax240z Posted December 21, 2004 Share Posted December 21, 2004 Well I know we've been through this topic before, but it's been a year or two and maybe someone has stumbled upon an answer and not posted it. The engine: N42 head 8.3:1CR Stock turbo bottom end SDS EM-6E MSD 6A MSD Wires 280zx coil 440cc/min injectors T3 turbo NPR IC 60mm TB The problem: At light to medium throttle openings there is occasionally a slight hesitation. Mostly this is noticeable when cruising down the highway at steady throttle inputs, at around the speed limit. This problem has existed since day 1 with this car. It also corresponds with a lean spike ok the wideband. These things have been altered or checked and did not solve the problem: - 3 different sets/types of plugs - Gaps from 0.044" to 0.028" - 2 different ignition coils - 2 sets of injectors (260cc & 440cc) - 2 different fuel rails - 2 different intake manifolds - 2 different intercoolers & plumbing - 2 different MAP sensors - 3 different fuel pumps - multiple modifications done to MAP signal with no effect on problem - 2 sets of ignition wires (MSD blue, MSD red) It's not a big deal, it doesn't seem to do it under boost or high throttle openings, it's just annoying. The only sensor on the car that isn't new is the TPS, but I cannot get any kind of erratic reading out of the TPS when manually opened and checked. I'm kinda thinking I've either got a wiring issue somewhere, or my MSD box is faulty. Ideas? Quote Link to comment Share on other sites More sharing options...
GrayZee Posted December 21, 2004 Share Posted December 21, 2004 My buddy had similar problems with his RB26deTT with SDS. The engine had very slight hicups and hesitation under certain load conditions. Overall it was a minor detail but was still annoying. He never did figure it out, but I'm betting that he didn't spend a huge amount of time trying to correct it either. He isn't on this board much anymore but I'll ask him to read your post. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted December 21, 2004 Share Posted December 21, 2004 Well when you gone this far... I'd say pop in a new TPS.. you never know. I've seen LOTS of electronic sensors/ect check out OK, but once replaced, solve a problem. But a loose/corodeed wire could be the problem as well.. maybe as you're driving, it vibrates 'just right' under ceartain conditions, and breaks contact intermitently.. Quote Link to comment Share on other sites More sharing options...
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