Engine/Transmission (1998.5 - 2002) Rpm's Moving During Warm Up

[DIESELWRKS]

Well to explain what is going on is on warm-up my rpm's go from 800 rpm's to 950rpm's than back down and repeat this. at the same time rpm's move my fuel pressure reading surges and moves 6-7 psi. as well as my elec-power, my lights on dash will dim slightly as a load was being pulled this does not happen all the time seems to be worse during cold mornings.











2002 HO 6-SPD LB 4X4 QC HTT 62/14 SB-FE SMARTY TST PM3 MACH 4'S, RINGED AND STUDS, AFE/2 "SILVERLINE D/PRICOL PYRO,BOOST,FUEL FASS 150, VULCAN 1/2 DRAW-STRAW, VULCAN 3/8 FUEL LINE AND FITTINGS, DSS 03 TRAC-BAR DSS BOX TURN-OVER BALL, RIDE RITE AIR BAGS. SUPPORT 17'' KMC BLACK HOSS, 315/70/17 MICKTHOM BMTZ'S 6" RCD LONG ARM LIFT AND DE-BADGED FOR FUEL MILEAGE. :-laf

 

[JFaughn]

That may all be normal , cycling of the intake heaters , they draw a lot of current , as they make warm air , the engine runs better , then at higher RPM & warm eng . the intake heaters stop cycling .

 

[DIESELWRKS]

yeah I have been told this I guess this is the first time I have noticed this during the colder weather. but I dont understand my fuel pressure would change this much during this draw/cycle.



thanks for the reply

 

[TCluff]

Electric fuel pump... grid heater draws ALOT of power and your pressure surges till heater shuts off!

 

[Bob Cochran]

Electric LP when voltage drops pump slows, lower LP pressure, as voltage rises LP speeds up pressure back. Grid heaters need a lot of current cause pretty large voltage fluctuations.

 

[DIESELWRKS]

Thanks For The Help And Have A Great Holiday