So I am having an issue that I am lost on!

I have had an on/off cold idle and drivability miss. Once the engine is to temp there is no issue.

On cold start up I have been watching FLP, FMP, IPR% and volts. I also have done a contribution test on the injectors with a SnapOn Solus scanner cold and hot. Both times the injectors showed the same results of no issues. The only thing it has shown consistently is P0403, P0404 and P0405(iirc) all pointing to an EGR issue.

The values are as follows:

Cold 10-12 hr cold soak

Vlt: 12.7
IPR: 22.5-28.5
FLP 10.5
FMP 47.5

10-15 mins of run time

Vlt: 13.7
IPR: 18.5
FLP: 13.5
FMP: 48.0

I pulled the EGR and cleaned it and used a shop vac to suck out as much carbon as I could. Still the same results. Cleared the codes and have been running it since with same results. I have not had the time to rescan it with my buddies snapon scanner.

Tonight when I started the truck after a 7 hour soak the readings were as follows:

Vlt: 10.9-14.4
IPR: 22.5-24.1
FLP: 13.5
FMP: 48.0

I only drove the truck 5 miles from the fair grounds home, so there was no real warm up. The volts hunted the whole time which is odd. It has not done that since I replaced the alternator 9 months ago.

Also the ICP# is anywhere from 840- 640 on the cold soak starts. The average warm idle ICP# is 645.

I am leaning towards the EGR being an issue, but am not convinced that is the only issue I have.

Any help where to look would be appreciated.

 

Post ICPV @ KOEO


Shure could be EGR Relaited your Misfire

Is the EGR Valve plugged in??

P0403 EGR Exhaust Gas Recirculation Control Circuit Open circuit, short to ground or voltage, EGR valve
P0404 EGR Exhaust Gas Recirculation Control Circuit Range/Performance EGR sensor or valve, EGR position circuit
P0405 EGR Exhaust Gas Recirculation Sensor A Circuit Low

Kinda looking like New EGR Valve Time or Deleate it and even if you deleate it you should replace the egr valve

these Trucks Need a Electronicaly Sound EGR Valve No Matter What

 

Before EGR Valve replacement you could try this

You could check with a DVM @ the EGR Valve Plug since you have P0403

Check Imput/output signal

 

IIRC the ICPV was 14.0 KOEO.

I will check it in the AM.

Yes it looks like a new EGR or delete. I am leaning towards a delete. I wish I had the $ to do the full bullet proofing. I found a guy that comes highly recommended and does the job for $3800-$4200 that includes parts, labor tuner and heads serviced.

 

Pull the plug and probe or back probe while it is plugged into the EGR valve?

 

Yes do check this Gauge Cause this is a Bad ICP Reading

If the Above is True you need a New ICP Sensor

IIRC its ICPV .18-.24 is a Good ICPV Reading @ KOEO

 

I wonder if I have that programmed in the scangauge. The ICPv is the voltage correct? The IPR is open percentage? The ICP is pressure?

Still a greenhorn on this diesel stuff!

 

That IPR% is red Brings the HPO System into ??

in addition to the ICPV @ .14


ICP Voltage (Volts)
TXD: 07E02216AD
RXF: 0462451606AD
RXD: 3010
MTH: 004827100000
NAM: ICV
KO=0.2 LI=1.0 HI=1.8 OR=.15-4.7 Volts

IPR Duty Cycle
TXD: 07E0221434
RXF: 046285140634
RXD: 3008
MTH: 0DCA03E8000A
NAM: IPR %
KO=14.84 LI=24 HI=40.60 OR=0-50 %

 

Looks like the IPR DC is out of wack on mine. KO value looks right I think. the LI and HI look off! My LI is 18.5 to 25.0 and I have seen higher than 40 from time to time.

BRB with IPV #'s in a few mins!

 

Yes ICPV is Volts

It uses the 5 Volt V-Ref to Calibrate


Yes

Basicaly 0% is All the way Open Oil Dumping into Pan

And 100% Is IPR Closed all Oil going to Injectors

Your IPR% @ KOEO should be 14.8%



Yes ICP is Actual Pressure PSI Reading

Our Gauge just converts a Volts Reading into a PSI Reading

 

Ok I had to program the ICV in...

ICV KOEO is .14V
ICV running at idle is .84-.91

IPR KOEO is 14.4
IPR running at idle is 21.5-22.8

looks like an EGR delete and an new IPR is in the works....

 

Driving into work this AM the ICV fluctuated quit a bit.

Idle .81-1.0
70 mph 1.2-1.7
80 mph 2.0-2.8
WOT 6.5-7.3

 

Also WOT I saw 60.8 on the IPR until tranny upshifted and I lifted out of pedal.