Engine/Transmission (1994 - 1998) Long crank

[Cosmo]

So I have noticed that my 12-valve takes a while to actually fire over. Cold, hot, sitting for three hours or for two seconds, it doesn't matter.



If I blip the throttle as I start to crank, it fires instantly - as in less than one revolution and it's running.



Would this be an idle speed adjustment? I haven't put an optical tach on it, but the one in the dash seems to indicate it's running in the ballpark (warm, A/C on, in gear, blah blah blah). Or is it another adjustment?



I've been working on and off on a customer's '87 and it lights off without any throttle input. Granted it's a totally different setup, but I have known other guys with p-pumps that fire up like that too.

 

[moparguy]

Likely need to turn the idle up a bit. I run mine down in the low 700 rpm range and just hold the fuel peddle down a bit instinctively when cranking. Fact is it starts better and builds vac quicker (necessary for brakes, critical when doing low speed work with trailers on a hill) if the idle is in the 900 to 1200 rpm range.

If you're working on a 87 Cummins Dodge, it's a conversion since they didn't hit the dealerships till 89. Some interesting desirable 4 door conversions are around.

 

[Cosmo]

No vacuum brakes here, hydroboost on mine and that other rig. Only things running on vacuum on mine is HVAC controls and cruise.

The other truck is a 76 chevy crew cab long bed dually. It's got an 87 heavy duty engine in it, an allison trans (a real one, not one of the POS duramax ones), a gear splitter, an original kelderman rear air bag, and a lot of farmer engineering. It's got a hydroboost setup as well, but because it's got a school bus/straight truck engine, no vacuum pump. The power steering pump bolts to the timing case directly.