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Folks, if Base timing is set to factory spec of +3.5*BTDC, PCM will DESIRE +8.5*BTDC ACTUAL timing at idle, thus stepping the TSM thru +5* of advance to get there: +3.5* + +5* = +8.5* ACTUAL idle timing, thereby losing almost half of the advance range in the process If Base timing is set to...

You completely ignored my statement that DESIRED and ACTUAL must match within a degree or so - then you post more confusingly erroneous mis-information - what is it with you, Buddy? Are you dyslexic?

Take a look at the wiring harness connections around the IP: 8wire OS harness, 6wire FSD harness, 4wire TSM harness, 3wire CPS harness, etc - make sure each connector is fully seated, then disconnect and check for oxidation\corrosion, etc - if all clean, reconnect Also check the PCM wiring...

Closest parallel I can think of is the old vacuum-modulator on the side where the distributor was base-timed with the vac disconnected - when reconnected the vac assist made the engine run better at both ends of the mechanical advance curve - TDCO does way more than that Base timing is just...

DS4 Injection Pump The DS4-831-XXXX Diesel injection pump is a rotary Distributor-type Solenoid-activated 4 pumping-plunger 8 cylinder 0.31" plunger-diameter model - the four remaining digits denote Stanadyne final calibration specs - it is a constant-beginning variable-ending pump design with...

A - Stanadyne flowbench procedures are not comparably compatible with those required by in-vehicle systems B - If the EFI values are already correct when doing TIMESET and TDCO LEARN, no change in operation will be observed - if the IP is moved, several things change noticably, beginning with...

Not even true, Buddy, which erroneous posting makes it difficult for some to grasp the truth - see the new TDCO sticky for full disclosure

Simply put, actual injection timing is adjusted by rotating the IP, and the setting in degrees BTDC is stored when TIME SET is commanded - TDCO is compensation used by PCM to run at that setting, and is self-adjusted by PCM when TDCO LEARN is commanded in OBD1 systems, or KoKo is performed in...

Already is a LP relay, thoughtfully provided by the engineers at GM - it's that large semi-round one up on the firewall, adjacent the LP fuse - controls the LP in START - have to be careful if rewiring it, as any applied voltage will energize the starter solenoid - I used 3amp diode or-gate...

They're just soft copper - a very sharp small chisel and some very sharp finesse will resolve the issue...............

Two o'rings, the captive one on the new fuel filter and the not-removed old one stuck in the cap-ring, result in fuel leaks, as does a split plastic cap-ring, as do sensor and heater seals - correct LP function: - OBD1 LP runs during START, then with rpm signal and oil pressure permissive...

The GM elect fan clutch is also a Horton unit, iirc - been a while since it crossed my mind, nearly 3yrs, now - but, also, iirc, the hub\shaft dia was the main ? at that time, too - looks like she followed thru, where I just Dodged it.............

Remove the RTV glob from the slot - pull the angled section of the bi-metal strip outta the slot, gently straighten the angle, bending to conform to the rest of the coil, leaving a very small lip that will fit in the slot - re-RTV the stip (strip tip) in the slot, let cure, and voila!!!!!! - yer...

Lo, and behold! Speak of the devil, and angels appear - saw Missy Good Wench's handle in another thread, popped over there, and there she is, describing the mechanics of installing the electric fan clutch on her 6.5 waterpump - just remember to use a spacer-block on the impeller side of the...

'06's come from the factory with the '83 CCV\CDR configuration already-been-adapted for turbo mode, so the current parts are available new (as well as the lucky used '83 find), and should be falling into the boneyards any moment, now: filler tube, timing trainset splash-shield, re-configured...

I charge the batt's on my truck once a month, prime the fuel line, fire it up to see if the old thrill is still there - today I re-noticed two things of import, one the CDR configuration, the other relating to the current threads on fan clutches, fans, cooling, etc The '90's CDR system has...

Corrective procedure when installing DMax fan is merely trim the 90* angle lip off your fan shroud.................

Ok, my bad - I got off into your sig by misteak............

None that I know of, Schiker - I was referring to the unbalanced flow doubly affecting the passenger side of the block due to the additional heat of the turbine - noone prolly would have noticed if the reduced flow had been to the cooler driver's side - I'd like to see one of the new service...

Look for ENGH MOTORS in our vendor section, author\vendor of GMTDScan Tech, a pc-based OBD1 scantool