p0700 code engine rough idle

[andycan]

this code comes up on my 95 gmc jimmy 4.3 vortec w ....... engine is idleing rough changed intake gasket ......got timing off... reset timing come up with cam sensor bad so i replaced distributor .plugs, wires, coil ,catalytic convertor (wich was bad) nut kit has been changed spider ok engine rpms goes up and down 700-1200 rpms could the timing still be off ?

[old_master]

If the engine is not running correctly, it's very possible for transmission DTC's to be set and NOT set any engine DTC's. P0700 indicates a problem with transmission controls, (usually solenoids or a wiring problem). Diagnose the rough idle before the P0700.

When the distributor is removed and reinstalled, if P1345 is set, it typically means the distributor is off one tooth. If you're not seeing P1345, the distributor is installed correctly and ignition timing is ok.

Here are a few things to check:
Fuel pressure and leakdown. With Key ON, engine OFF, and the fuel pump running, fuel pressure must be 58psi to 64psi and must remain above 53psi for 3 to 5 minutes after the fuel pump shuts off.


Have you replaced the distributor cap and rotor? Did you use silicone dielectric grease on all terminals inside and out?

CMFI engines can be very fussy when it comes to secondary ignition parts: Spark plugs, wires, distributor cap, rotor, and ignition coil, AC Delco is recommended. What brand and part number spark plugs did you install?

Post your results.

[andycan]

I will double check fuel pressure i had someone else do it for me ....plugs are ac .i did replcae cap rotor button ; distributor, wires coil all are new i did use the dielectrec grease when i put the wires in jimmy was running fine until i changed the lower intake gasket put every thing back together on torq specs then the nut kit was leaking so it got changed along with new plugs ,,,oil changed

[old_master]

These might help with locating TDC & aligning the distributor:








This might help with distributor cap wiring: