im no expert but it sounds like there is something electrical going on.
maybe the ecm, maybe a bad ground?
maybe the ecm, maybe a bad ground?
Fueling issues.
- Thread starter minerigger
- Start date
I'm definitely leaning to the electrical to. How do you check for a bad ground? Or a bad ecm?
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Best way to check bad grounds is with a multi meter and check the resistance.
You when you had your normal fuel temp log how did the truck run? Was it still acting up or was it still not running/ driving right?
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You when you had your normal fuel temp log how did the truck run? Was it still acting up or was it still not running/ driving right?
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No the truck runs good until 1600 rpm then it cuts fuel off at 15k
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The resistance on the iat sensor and the fuel temp correct? I've got a fluke meter but I'm not gonna lie...electrical shit and I DO NOT get along. It frustrates the hell out of me.
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Anybody know what kind of resistance to IAT sensor and FPR should have? Trying to test and see if mine are good or bad
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Ok so I pulled the Intake and ic tube off and pulled plugs apart and tested. I tested MAF, IAT (the one in the bridge), FPR, and FRT.
So here are the values I got. Air temperature at the time of test was 60*F
MAF sensor- 2.258 k ohms
MAF harness plug- 3.240 k ohms
IAT sensor- 7.42 k ohms
IAT harness plug- 4.223 k ohms
FPR- 2.7 ohms
FPR harness plug- 1.872 M ohms
FRT sensor- 2.837 k ohms
FRT harness plug- 3.254 k ohms
For you electrical wizards tell me if I have good or bad stuff.
So here are the values I got. Air temperature at the time of test was 60*F
MAF sensor- 2.258 k ohms
MAF harness plug- 3.240 k ohms
IAT sensor- 7.42 k ohms
IAT harness plug- 4.223 k ohms
FPR- 2.7 ohms
FPR harness plug- 1.872 M ohms
FRT sensor- 2.837 k ohms
FRT harness plug- 3.254 k ohms
For you electrical wizards tell me if I have good or bad stuff.
Ok fellas well made some progress, not sure how but we did. Now when I am logging my desired rail pressure and actual are spot on, in fact I have about 200 psi more actual vs the desired. But I still cannot get over 2k rpm. so I guess ill do another bottle test tomorrow and try unplugging the fpr again. This f**kin truck is aggrivating
What mm3 was it hitting? I'm trying to remember.... I didn't get all emails finished up today but in going in at 5am so if I didn't respond today expect a response tomorrow.
Thanks man,
Kory
I'm not sure Kory. I dunno if ive got the correct pid selected. Willie gave me the shop number so ill give you a call tomorrow and get a list of what pids you need for sure.
Thanks for the help sir.
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Thanks for the help sir.
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And I sent another log to Willie over the weekend. Something along the lines of "making progress on lo Maf tune"
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That's no problem... I'll check it out first thing am! Only had 20 emails left so I'm sure it's in there
Works for me man. Hey what kind of resistance as far as ohms should I be getting from the MAF, IAT, FRT, and FPR. I checked em this weekend but not sure how many ohms I should be getting, or if it was even a viable test or one of those with to many variables
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The engine has several grounds on it. I know there is one on the back of the driver head to cab. Three on the driver side block at front terminating at two bolts. One of these is from driver side battery. Passenger side near front is another 2 or 3 grounds termination to 2 bolts.
I think there is one from the driver side positive battery jump terminal support also.
I think there is one from the driver side positive battery jump terminal support also.
Also check http://www.gmupfitter.com/pages/body-builder-manuals as there is a list of grounds in the electrical area.
If you dig deep enough and know what to look for, the resistance values are probably buried in there.
If you dig deep enough and know what to look for, the resistance values are probably buried in there.
Lawless are you saying that I wont get good resistance readings due to the multiple grounds? OR am I off and not following you at all?
Each of the grounds go to different things. If the grounds are not all connected, you can get back feeding issues. Back feeding issues cause strange things to happen.
I know where a bunch of grounds are since pulling the engine in my truck and having blinkers and lights do strange things.
I know where a bunch of grounds are since pulling the engine in my truck and having blinkers and lights do strange things.
Ohhhh ok, well thanks for that handy site and the tip. I will for sure go double check all of them. I really appreciate the help guys
Update on this.
Kory sent me another modified tune to try on Tuesday morning. Didnt get a chance last night so went and loaded it this evening.
Holy sheet! She scoots right along meow. I'm not sure what the man did but he fixed her. She pure now. Little rich but hey moar fuel is better than not getting enough.
Kory you are the man! Can't thank you and Willie enough for the hours of help, tons of emails, and putting up with me. Really appreciate the help and getting the truck back up and running. You sir gave top notch customer service. Thank you very very much, I'm extremely happy with it.
Brock
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Kory sent me another modified tune to try on Tuesday morning. Didnt get a chance last night so went and loaded it this evening.
Holy sheet! She scoots right along meow. I'm not sure what the man did but he fixed her. She pure now. Little rich but hey moar fuel is better than not getting enough.
Kory you are the man! Can't thank you and Willie enough for the hours of help, tons of emails, and putting up with me. Really appreciate the help and getting the truck back up and running. You sir gave top notch customer service. Thank you very very much, I'm extremely happy with it.
Brock
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