Year of Manufacture *: 2008 Engine Size and Code *: 3.0 4JJ1-TC (DELPHI) ( Optional ) Scanner Used: Tech 2 ( Optional) Fault Codes: none
Hi
Seems to be my week!
This Isuzu cuts out at idle.
Live data shows
Desired fuel rail pressure (1000 rpm) 55 MPa Actual fuel rail pressure (1000rpm) 37 MPa (varying) With actual dropping down to 10 MPa before it cuts out.
My first check was fuel supply from the lift pump in the tank. There is no spec that I can find in the factory manual apart from, and I quote "place your hand on the bottom of the tank and feel for vibration to confirm fuel pump works"
There is no fuel contamination and charging volts are 14.5v
Anyhow, there is no flow and no pressure from the fuel tank lift pump. When I check the current on my Pico scope it gives a poor trace ( sorry, not saved )
Can anyone tell me what pressure and flow I should expect, so I can check the operation of the new pump.
I must add. That even though there is no pressure, the engine still runs and revs up. In fact the pressure improves the higher the RPM. I must assume ( correct me if I am wrong ) that the high pressure pump acts as a suction when moving faster.
Hello mate just done a trooper same fault done a oil and filter change and it workes they have to have good oil pressure to get fuel pressure because it has a oil valve built into the pump which also block if not serviced.
Hello Simon, The last Rodeo i did was an import plus lived its life as a farmers pick up and he had no idea there were 2 spin-on fuel filters underneath the vehicle both on the N/S(left side) chassis rail sort of in-line with passagers front door (if its a double cab) If its the original filter you may need the numbers. The filters were in a bad way I'm sure he had a bit of home brew going through from time to time but he said he was sure its only ran on official pump fuel (Honestly your Honour ) Thanks, Ian
"This should be the HEUI set up and warrants a bit of reading before you go too deep."
This is the Delphi common rail system. Electronic lift pump in tank.
Regards
Simon
It's the later system then
In that case it's a basic CR system with standard test procedures and dead heading as needed.
Mark Modern cars, Its all wizardry and witchcraft
Fixed #
Posted by Simon Forsey on March 10, 2015, 10:00 am, in reply to "Re: Isuzu Rodeo low fuel pressure" Edited by board administrator March 14, 2015, 5:05 pm
Hi
Thanks for your input.
The spec on the lift pump is 10cc per ignition on cycle. Isuzu say 'switch ignition on then off for three cycles giving 30cc off Riel's
As the lift pump didn't pump any fuel a new one was fitted with only a slight improvement.
I next checked the current and voltage of the SCV. When the engine faltered the current would rise about 250ma. This was not a lot compared to the Toyota SCV when faulty but enough to raise suspicions.
A new SCV was fitted and a re learn performed and the engine now runs well
Hi 
on March 5, 2015, 2:01 pm, in reply to "
(Honestly your Honour 
) 