240hoke Posted May 12, 2003 Share Posted May 12, 2003 I posted a while back about not being able to rev past around 5000 rpms. The problem occurs at idle and under load. Also at the time it stumbles the tach needle jumps all over the place. At idle i can notice a puff of white smoke come from the exhaust. SDS and ScottieGNZ have been very helpful but im still not having any luck making progress. This is what i have done so far: -Check magnet positioning and replaces all magnets -Check hall sensor alignment -Reroute all ignition wires and change spark plugs and wires -Revamped fuel curve -Turn knock sensor off over 3500 and cut down sensitivity I also want to add that i am getting no rpm error anywhere. Any advice or comments are welcome, i'm getting really frustrated now as it's been several months. Thanks in advance! -Austin Hoke 74 260zt http://www.geocities.com/datsun260zt Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted May 12, 2003 Share Posted May 12, 2003 You may want to run a leak down check on the motor...may not be the SDS at all... Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted May 12, 2003 Share Posted May 12, 2003 Did you check the valve/rocker clearance like we discussed? Quote Link to comment Share on other sites More sharing options...
Guest JAMIE T Posted May 12, 2003 Share Posted May 12, 2003 Is this engine fresh? Valve springs? Quote Link to comment Share on other sites More sharing options...
Guest thepenguin99 Posted May 12, 2003 Share Posted May 12, 2003 Sounds like more is going on than the SDS. Run a leakdown test on the engine and make sure everything is ok. I have seen cars do similar things with a busted head gasket. Quote Link to comment Share on other sites More sharing options...
240hoke Posted May 13, 2003 Author Share Posted May 13, 2003 Hello, Thanks for the replies Scottie, I adjusted all the valves according to the haynes manual, they were pretty loose but still havin the same problem. I ran a compression check this afternooon and ran 152 across the board with 155 on #6. -Austin getting more confused everyday The penguins are starting to steal my sanity Quote Link to comment Share on other sites More sharing options...
240hoke Posted May 13, 2003 Author Share Posted May 13, 2003 Oh JAMIE T the engine has just been rebuilt and new set of valve springs were installed, still on the stock cam and rocker arms. Quote Link to comment Share on other sites More sharing options...
R0N Posted May 15, 2003 Share Posted May 15, 2003 "not being able to rev past around 5000 rpms" Sound familiar, try turning off the knock sensor completely. Quote Link to comment Share on other sites More sharing options...
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