No idle after top end rebuild?

[Scott]

10psi of cranking compression and it still runs?

Just for fun, if you hold the throttle safety switch in (the hinged part at the throttle block), will it still idle?

While it's idling...
Do you have headlights?
Does the dash gauge still work?


Have you checked the power at the DC and AC wire harness down by the voltage regulator on the clutch cover?

 

[BILTIT]

Try another compression gauge.

 

[wagnerta]

Try another compression gauge.

Tried another gauge. This one says 30psi.
So new top end, rings gapped to .020 i believe? right in spec though. What could cause such low compression in both cylinders? I order OEM Cylinder O-rings to try that but what else could it be???????

 

[Right on with a C]

Hey there, late to the party but i just rebuilt my 15 pro and am having same issues, wondering if you were ever able to figure yours out? when i was trying to get it running i did move the tps sensor and got it to idle fine but has no power under load on flat ground and cuts out. adjusted my TPS to factory specs and now back to not idle and backfire. looking for help here its making me crazy. Thanks

 

[sledtahoe]

10 psi something is up or the compression gauge is not reading correct?

 

[Vincenthdfan]

Gotta make sure you hold throttle body butterflies wide open too when youre doing compression test so that the engine can get some air to it as well...easily forgotten step if your not well versed in doing them.

 

[diamonddave]

Gotta make sure you hold throttle body butterflies wide open too when youre doing compression test so that the engine can get some air to it as well...easily forgotten step if your not well versed in doing them.

Exactly. Sounds like the OP is long gone and never reported back but there’s no way that sled is going to start on 10lbs of compression