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Engine/Transmission (1998.5 - 2002) Idle Speed, APPS and and and

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2nd Gen Non-Engine/Transmission Keyless Entry - No Horn

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Hello all.



Over here we actually have a fire in the fireplace... around 10 degrees Celsius... and raining.



Anyway, I was doing a search of the forums, trying to be a good boy before I posted, but ended up with more questions. Typical.



First, I always thought that the idle seemed a bit high on the truck... around 1100 IIRC. More important, it seems that although the truck should have max torque at around 2. 5-2. 7K, it really seems to be before 2K that most of the torque is available. (Truck has 4. 11 rear).



The DPO changed the injector pump around 10K ago. Of course he did not know what U-joints were when I told him they were toast... And naturally, I do not think that he ever changed the Trans or Diff fluid either. Taking care of that tomorrow. When I asked about the lift pump, he insisted there was no other pump #@$%!



I installed as set of gauges from Glow Shift... not bad for the price. YGWYPF.



Fuel pressure is a bit erratic, but mostly around 10 PSI, sometimes spikes to 15 or so, goes down to 7 sometimes. ( A FASS DDRP is sitting in Wiesbaden, waiting to be picked up and installed)



Turbo pumps up to 25 PSI at WOT, and the EGT goes up to 800 degrees when I come up the hill to the house. Normally, putting around, it is around 300-400 when under minimal boost.



So, back to the issue. I found some info on the APPS /TPS, and will check the value tomorrow if I have time when I am in the shop swapping out the PS wheel bearing...



But, shouldn't the value be set at correct idle? From what I have read, no one has referenced this. Either the idle speed is set by the ECM when the correct value is there, or it is a combination of both.



The question arose when I read about the Timbo replacement unit. (I am going to order one to have in stock...



I have been too busy to look in the FSM for proper values and settings. Man, I need a book. Having the thing as a PDF is a real PITA... Thanks JK



BTW, Truck got its' colours yesterday...
 
TQ peak will be arounf 1900-2000 rpms on that truck. Thats where a jerk pump generates the power. The later CR's are around 2500 rpms.



Idle at 1100 is too high. You should be around 750-800 with AC on.



Yes, GlowShift is definitely a low cost low performance solution. Their fuel pressure sending units seem to be crap, 2nd one just took a dump on the 92 we have it in.
 
TQ peak will be arounf 1900-2000 rpms on that truck. Thats where a jerk pump generates the power. The later CR's are around 2500 rpms.



Idle at 1100 is too high. You should be around 750-800 with AC on.



Yes, GlowShift is definitely a low cost low performance solution. Their fuel pressure sending units seem to be crap, 2nd one just took a dump on the 92 we have it in.



Thanks for the info. As for the sending unit, is there a replacement I could substitute? Thanks. Was yours installed with the snubber valve? JK
 
TQ peak will be arounf 1900-2000 rpms on that truck. Thats where a jerk pump generates the power. The later CR's are around 2500 rpms.



Idle at 1100 is too high. You should be around 750-800 with AC on.



Yes, GlowShift is definitely a low cost low performance solution. Their fuel pressure sending units seem to be crap, 2nd one just took a dump on the 92 we have it in.



Ok, Idle speed was wrongly quoted... it is right wherer you said it should be. Thanks for the info on the power curve. Yep, at around 2K it is 'all-in' I still have not had time to check the APPS, too busy, but the truck runs great.



I will probably check it when I have the batteries disconnected to install the lift pump...
 
The engine manufacturer, Cummins, or Dodge in their factory brochures shows that peak torque on your engine is produced from 1600 to 2700 rpm. Peak horsepower is developed at 2900 rpm.
 
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