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  #31 (permalink)  
Old 03-04-2013, 04:49 PM
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That's what I was thinking. Just wanted to make sure. Thanks

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Old 03-05-2013, 06:35 PM
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Hi Guys just wanted to let you all know. That my truck is still running like crap. But it did bring up 4 codes. But nothing for a miss fire. I did notice that I am going on my 3rd set of plug wires. Some reason 6 and 8 burns them up melts them. Not sure what causes that but anyways.
Here are the codes.
p102.
P113.
P137.
P1406.
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  #33 (permalink)  
Old 03-05-2013, 06:49 PM
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Quote:
Originally Posted by tommyboy8072002 View Post
Hi Guys just wanted to let you all know. That my truck is still running like crap. But it did bring up 4 codes. But nothing for a miss fire. I did notice that I am going on my 3rd set of plug wires. Some reason 6 and 8 burns them up melts them. Not sure what causes that but anyways.
Here are the codes.
p102.
P113.
P137.
P1406.
P0102 is a MAF sensor circuit/range problem. Could be the fuse (ECM 1 I think) The wiring harness could also be the problem.Check for 12 V + at the sensor.
P0113 is intake air temp sensor circuit low.
Both of those could be caused by having them unplugged with the key on.
P113 is bank 1 sensor 2 (bank 1 downstream O2) circuit low voltage
P1406 is EGR circuit trouble of some kind.
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Old 03-05-2013, 08:09 PM
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Ok 1406 is a Egr valve pintle position circuit. Will this cause pinging? I Also found a bad Ground wire. but I don't know if that would cause this truck to run like junk.
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Old 03-05-2013, 11:34 PM
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bad running

was the bad ground from the block to the firewall? A bad ground there will make it run like shard.
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Old 03-06-2013, 05:08 PM
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If the transmission was out I would be willing to bet that you have grounds that go on the bell housing bolts that are not connected or broken. The other think to check is to make sure the harness is not pinched between the engine and bell housing. I have seen a lot of these type of issues after a tranny was out and back in.
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Old 03-06-2013, 07:18 PM
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Yes. The ground that broke goes to the motor to the frame. I will double check the wires. Just to make sure there not pinch between the bell housing and the motor. Thanks guys ..
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Old 03-06-2013, 11:05 PM
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Bucking

Yes...a broken ground strap will cause it to run like sh##. Had a buddy tear half his engine apart trying to fix his...it would start, backfire, pop, stall and then start right up and do the same thing. I went out to help him and found the ground wire from engine to frame broken...ran a jumper cable from the engine to the frame and it started right up and ran great. Easiest way to check it.
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Old 03-07-2013, 05:46 PM
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Quote:
Originally Posted by tommyboy8072002 View Post
Ok 1406 is a Egr valve pintle position circuit. Will this cause pinging? I Also found a bad Ground wire. but I don't know if that would cause this truck to run like junk.
Yes a failed EGR will cause pinging. The injection is programmed to deliver the correct mixture for the air bearing oxygen present in the intake system while the EGR is also putting in an amount of inert exhaust gasses. If the EGR is not putting the inert exhaust gasses into the intake that space becomes occupied by air with oxygen. The computer has no way to know this so it continues to fuel as if there is a mixture of fresh oxygen bearing air and inert exahust gas rather that a lot more fresh air and no exhaust gasses. This causes the mixture to fall lean which will result in pinging and back firing.

Bogie
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Old 03-07-2013, 08:11 PM
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Thanks For the heads up. Bogie I haven't had the chance to work on it yet. But when I do will let you know. Thanks again..

Tommy
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Old 03-08-2013, 08:01 AM
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You can unplug the EGR motor's connector and see if the issue remains. You can remove teh 3 bolts and clean the EGR as well to make sure the pintle valve isnt stuiuck with carbon.

Bad running can be caused by a bad O2 sensor causing bogging and teh engine to "load up" with fuel when in closed loop. If the issue clears up at WOT, O2 sensors can be the issue. At WOT the PCM doesnt read the O2 sensors, so better WOT running can be indicative of O2 sensor problems.


If its the popets here is the CSFI to MPFI conversion from GM.

CSFI to MPFI - Vortec Engine Fueling Fix - Fuel Injection - Off-Road Magazine
And here is some cleaning info
http://www.acdelcotechconnect.com/pd...sb_05D-105.pdf
peace
Hog
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  #42 (permalink)  
Old 03-08-2013, 04:42 PM
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The 2 top bolts that connect the engine to the tranny should be studs and both should have grounds on them
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  #43 (permalink)  
Old 03-08-2013, 04:54 PM
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Originally Posted by T-bucket23 View Post
The 2 top bolts that connect the engine to the tranny should be studs and both should have grounds on them
It also an excellent idea to seperatly ground each head. The extremely high energy ignitions used to jump .060 plug gaps dump a lot of energy into the heads searching for a ground path. We have passed the point where one can assume this energy will find its way to the battery ground by hoping the head bolts and other accessories are providing an adaquate path to the block where grounds usually originate from back to the battery.

I highly suggest a good ground one that can be verified from each head to the block or from each head to the chassis or to the battery's negative terminal be established. This does not need to be a huge wire as there is not much amperage involved. So a number 8 or 10 wire with suitable terminals is sufficient.

For those of you who are loosing MSD boxes and MSD tells you you it's high voltage getting into the box, this baby is the source, it ain't an overcharging alternator.

Bogie

Last edited by oldbogie; 03-08-2013 at 05:20 PM.
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Old 03-08-2013, 08:11 PM
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I found only one ground wire on this truck it goes to the motor to the battery.
I am going to do like bogie said and run two ground wires one to each head. Then to the frame. Also going to clean the egr and see if that helps. But I was thinking on going with to big ground wires. Just because there are no other Grounds. I was looking at the wiring harness I didn't see any ground wires. I hope the heads will work.
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Old 03-08-2013, 08:33 PM
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Grounds

Big grounds won't hurt. Just take a minute to test it though...take your negative cable on your jumper cables and hook one end to the frame and the other to a head bolt or intake manifold bolt and see if it starts up and runs better...take you 1 minute to try it.
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