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Mar 7, 2007 | 07:00 PM

#61

pullinair

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From: Mountaintop, PA

ok went to pull wire harness at valve covers. I didnt break anything YET but I cannot get them off. I'm pushing down on the center peice and pulling out with my other hand. Any tips.

Mar 7, 2007 | 07:12 PM

#62

Uzumati

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From: Central, Al

Take a flat screwdriver and GENTLY pry at a corner while pressing on the center lock. They are definitely bugger to get off.

Mar 7, 2007 | 07:22 PM

#63

pullinair

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From: Mountaintop, PA

Allan, is that #6inj reading bad? It's just outside the <5 spec. What type of Ohm would I truely see if I had a bad harness?

Mar 7, 2007 | 07:31 PM

#64

Uzumati

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From: Central, Al

Over 5 ohms means there is an electrical issue it could be the connector on the inside of the cover or the injector

Check these pics out they will show you what to look for on the interior plug

Mar 8, 2007 | 02:17 PM

#65

pullinair

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From: Mountaintop, PA

Quote:

Originally Posted by pullinair

Got my readings:

inj#1- 3.5
inj#3- 3.5
inj#5- 3.5
inj#7- 3.5

inj#2- 3.5
inj#4- 4.0
inj#6- 6.0
inj#8- 3.5

I didnt check at the valve cover yet its dinner time but I might give it a shot after dinner. When I test the Gp's you said to put a probe on the negative terminal. Did you mean the negative terminal of the Batteries?

Ok I ohmed at the valve covers today, this is what I found.

-Drivers side:

inj#2- 3.0
inj#4- 9.5
inj#6- 8.6
inj#8- 3.2

-Pass. side:

inj#1- 3.2
inj#3- 3.2
inj#5- 3.2
inj#7- 3.2

Allan, Why would inj#4 and #6 Ohm higher at the valve cover than at the IDM plug? I thought it would be the other way around wiith all the wiring adding resistance to the injectors.

Last edited by pullinair; Mar 8, 2007 at 02:58 PM.

Mar 8, 2007 | 04:26 PM

#66

John311t

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I would be taking the driver side valve cover off and checking those wires. It looks as if the wires inside are a bit screwed up, a possible reason for the higher ohms, did u drive the truck today? That could of moved something a little bit and caused more, thus increasing the chance that there is something wrong with the inside under the valve cover.

Mar 8, 2007 | 05:32 PM

#67

pullinair

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From: Mountaintop, PA

I think I fugured out why I was getting different reading on a warm engine Every injector specs <5 ohms at the IDM plug. HUH???? And on a stone cold engine # 6 ohms at 8.6 and #4ohms at 9.5 @the IDM plug. So why does the engine have a shake as it warms up as #4 and #6 come back down to spec???? I'm officialy lost now.
BTW: the reason I havent just pulled the valve cover yet is becuase I live in an apartment complex and I'm not aloud to work on my vehicle. I'm working on finding a place to I can tear it apart at.
I dont want to loose faith in my newly learned diagnostic abilities so if anyone has explain the numbers above I'd appreciate it.

Mar 9, 2007 | 05:35 PM

#68

pullinair

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From: Mountaintop, PA

I scanned my truck tonight at a local shop hear is what I found, I used a snap-on scanner:

Buzz Test : Passed, all injectors sounded the same.
CCT: Passed, It didnt give any readings for each cyl.
Got these readings at idle:

RPM's=650
AP (V)=.54
Baro(Hg)=29.8
Baro(V)=4.69
Baro(Hz)=81
ARPMDES-None
ExhBackPrs=13-14
EBPV(V)=.80
EngineOilTemp=142
EngineOil(V)=2.04
ElectricalPressureCntrl(PSI)=0
EPC(V)=0
EPR%=20
FuelPW(ms)=2.47
Fuel Level Input(V)=0.000
IAT(V)=3.76
IAT(Far.)=34
ICP=Fluctuated from .80-.95
InjectControl(PSI)=Fluctuated from 485-510
InjectControlReg(%)=12
Map(Hz)=0
Map(PSI)=15
MFDES(Mg)=6
SCCS(V)=6.78
VFDES(mm3)=8
VPower14.3
VREF=5.03
AcclPedl(V)=.54

The shop owner let me go outside and use it so I didnt get any feed back on these readings. How does it all look?

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Mar 9, 2007 | 06:53 PM

#69

Uzumati

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From: Central, Al

All those look pretty good ICP and IPR are right in line for an idle reading. A CCT will not return values but if a cylinder is over 5% it will return a code. I believe that scanner has the capability of reading the "Rotational Velocity Change %" for each cylinder. If he will let you use it again look at that PDI on a warm engine and see what 4 & 6 are reading. I would bet they are <5% but greater than the rest

Mar 10, 2007 | 05:35 AM

#70

jetdoc

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Joined: Jan 2005

Posts: 2,902

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From: Pasadena, Maryland

Pullinair, resistance CAN change with temperature. Me thinks the next step would be to remove the valve cover and check the injectors directly. It sounds to me like your harness may be bad. Congrats on your new found abilities. You're never too old to learn something!