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Topic Review (Newest First)
12-19-2014 10:01 AM
waynehartwig
Quote:
Originally Posted by scarnek View Post
Scanner readings at idle 800 rpm +/-

Shtft 1 0-3.6
Shtft 2 0-3.1
Ltft 1 (-.8)
Ltft 2 .8
Map 4.6
Sprk 13-15
IAT 71-78
MAF .02

PCV comes out of the valve cover right into VAC on top of the truck intake.


Thanks,
Fuel trims look good. Don't know what the MAF is - lb or gr?

Sounds like you have something mechanical, like a TPS or IAC. Look at their values with your scan tool... Play with it and make them change.
12-19-2014 08:48 AM
Gemner
Quote:
Originally Posted by akecj7 View Post
The last time I check fuel pressure it was right about 58-60 psi. I will double check the pressure tonight and get a laser temp gun on the manifolds. If injectors are plugged should I just soak them in sea foam or is there different preferred method to clean them? I just bought a can of sea foam to put into the tank. Thanks for the help.
What year is the engine/ECM? Try checking the TPS reading at a few different pedal positions to see if it makes sense.
12-19-2014 08:45 AM
Gemner
Quote:
Originally Posted by scarnek View Post
Scanner readings at idle 800 rpm +/-

Shtft 1 0-3.6
Shtft 2 0-3.1
Ltft 1 (-.8)
Ltft 2 .8
Map 4.6
Sprk 13-15
IAT 71-78
MAF .02

PCV comes out of the valve cover right into VAC on top of the truck intake.


Thanks,
Which one? On the passenger side (near the top, at the throttle body flange) is the connection for the PCV off the passenger valve cover. The top (middle of intake) is the connection for the PCV off the drivers side valve cover.
12-18-2014 04:25 PM
scarnek
Quote:
Originally Posted by waynehartwig View Post
P0650 is a MIL light error - bad/not hooked up

What about your fuel trims?

Where is your engine PCV vent? It should go filter>MAF>vent>TB. The vent can't be between the filter and MAF. IT has to be between the MAF and TB. All air used by the motor MUST be metered air.

Scanner readings at idle 800 rpm +/-

Shtft 1 0-3.6
Shtft 2 0-3.1
Ltft 1 (-.8)
Ltft 2 .8
Map 4.6
Sprk 13-15
IAT 71-78
MAF .02

PCV comes out of the valve cover right into VAC on top of the truck intake.


Thanks,
12-17-2014 10:49 AM
Gemner Sounds like you have a vacuum leak doesnt it? Especially since you had no issues before hooking up vacuum lines? Check all of the parts that have vacuum as well as the lines. I found a cracked vacuum bottle on mine recently that I didnt know I had and couldnt hear any whistling.
12-16-2014 09:52 PM
waynehartwig
Quote:
Originally Posted by scarnek View Post
Psi at the rail idling was 45. Scan codes pulled up P0650. I unplugged the mass air as it was suggested it was to close to the filter and the motor ran way better. Still 45 at the rail though. Pump primes up to 55psi and holds that.
P0650 is a MIL light error - bad/not hooked up

What about your fuel trims?

Where is your engine PCV vent? It should go filter>MAF>vent>TB. The vent can't be between the filter and MAF. IT has to be between the MAF and TB. All air used by the motor MUST be metered air.
12-16-2014 07:46 PM
scarnek
5.3

Quote:
Originally Posted by waynehartwig View Post
VSS isn't going to matter, in this instance
No, driving it probably won't help - unless the injectors are plugged

Get a scanner on it and check your long term fuel trims. Also get a fuel pressure gauge on it - should be about 50, and then 58 with the vacuum line unplugged at the regulator - At idle of course.
Psi at the rail idling was 45. Scan codes pulled up P0650. I unplugged the mass air as it was suggested it was to close to the filter and the motor ran way better. Still 45 at the rail though. Pump primes up to 55psi and holds that.
12-16-2014 02:21 PM
waynehartwig
Quote:
Originally Posted by akecj7 View Post
The last time I check fuel pressure it was right about 58-60 psi. I will double check the pressure tonight and get a laser temp gun on the manifolds. If injectors are plugged should I just soak them in sea foam or is there different preferred method to clean them? I just bought a can of sea foam to put into the tank. Thanks for the help.
Sometimes they will clear themselves, with just running.


I like Lucas fuel treatment. I've found Lucas works VERY good, especially on old fuel that has varnished and completely plugged up carb/injectors.
Fuel Treatment
12-16-2014 10:28 AM
akecj7 The last time I check fuel pressure it was right about 58-60 psi. I will double check the pressure tonight and get a laser temp gun on the manifolds. If injectors are plugged should I just soak them in sea foam or is there different preferred method to clean them? I just bought a can of sea foam to put into the tank. Thanks for the help.
12-16-2014 09:44 AM
waynehartwig You need to check your fuel pressure

Also you need to make sure all 8 are firing, and are up to temp. Get a laser temp gun and hit each exhaust port while idling. They all should be right around 300*.

Yes, it looks like one bank is rich, and one lean. But it also looks like the longer it runs, the better they get. Plugged injectors causes stuff like this.

I'd also figure this out before putting new plugs in, as you might ruin them as well. If you have some not firing, then you have no choice but to replace those holes.
12-16-2014 08:02 AM
akecj7 So I am having some issues with my motor. First, when I can get it to idle after a cold start the motor will climb to about 1100 RPM and stay there even when the engine is at running temp (200* F). The only way I can get it to drop idle is to shut it off and restart, when this is done it idles at about 500 which seems right. Second, sometimes it will idle fine then start stumbling. I pulled my plugs and they are all (8) black as black can be. They are not wet just black. I pulled the motor out of a wrecking yard with about 120,000 miles on it so I am going to be replacing them tonight. Third, it seems to be running rich. I pulled the data below and would like to help interpreting the results. It seems like bank one is really rich and bank 2 is really lean. Is this correct? If so, what could cause it to be like this? Thanks for the help in advanced.



Here is the scan tools collected data.

12-13-2014 11:02 PM
waynehartwig
Quote:
Originally Posted by scarnek View Post
2001 LM7
Th400
Atlas 3.8
Walbro 255 (0-90) psi pump i think, bought a long time ago
Harness and tune done by Wayne.

Engine runs and if I baby it down to idle with the peddle its nice and smooth. Since I am running a TH400 I assume the "4wd" was removed as far as the VSS reading. My problem is that the engine wont start with out giving it throttle to get it going and wont stay running if I blip the throttle. Now like i said I can baby it down to idle and it wont die.

I didnt have the VSS hooked up at all until tonight i tried to wire it up to see if that helped the idle issue (it didnt). Its hooked up to the VSS that come with the atlas t case as my TH400 has no provisions for it (doesnt matter if im not running a 4L60 right?) Do i need to drive the buggy to get the ECM to recognize it has VSS hooked up now by chance? Should i be getting any Volt reading from the wires coming from the harness? Its a purple/white and Green/black i believe.

My next check will be to see if im losing fuel pressure somewhere. I am running the pump straight to the engine using the factory GM regulator thats on the rail, Also a return line back to the cell. Ports are on the bottom of the cell and the pump is mounted below that.

Weird thing is the damn thing didnt have this problem before i hooked up vac lines, even before i got the exhaust on it the thing didnt do this. I even tried to disconnect them all to start over

Any thoughts would be great, Wayne if you see this and can maybe look at my tune its Anthony Ferrara (tuned late last year maybe Jan)

Thanks,
VSS isn't going to matter, in this instance
No, driving it probably won't help - unless the injectors are plugged

Get a scanner on it and check your long term fuel trims. Also get a fuel pressure gauge on it - should be about 50, and then 58 with the vacuum line unplugged at the regulator - At idle of course.
12-13-2014 08:58 PM
scarnek 2001 LM7
Th400
Atlas 3.8
Walbro 255 (0-90) psi pump i think, bought a long time ago
Harness and tune done by Wayne.

Engine runs and if I baby it down to idle with the peddle its nice and smooth. Since I am running a TH400 I assume the "4wd" was removed as far as the VSS reading. My problem is that the engine wont start with out giving it throttle to get it going and wont stay running if I blip the throttle. Now like i said I can baby it down to idle and it wont die.

I didnt have the VSS hooked up at all until tonight i tried to wire it up to see if that helped the idle issue (it didnt). Its hooked up to the VSS that come with the atlas t case as my TH400 has no provisions for it (doesnt matter if im not running a 4L60 right?) Do i need to drive the buggy to get the ECM to recognize it has VSS hooked up now by chance? Should i be getting any Volt reading from the wires coming from the harness? Its a purple/white and Green/black i believe.

My next check will be to see if im losing fuel pressure somewhere. I am running the pump straight to the engine using the factory GM regulator thats on the rail, Also a return line back to the cell. Ports are on the bottom of the cell and the pump is mounted below that.

Weird thing is the damn thing didnt have this problem before i hooked up vac lines, even before i got the exhaust on it the thing didnt do this. I even tried to disconnect them all to start over

Any thoughts would be great, Wayne if you see this and can maybe look at my tune its Anthony Ferrara (tuned late last year maybe Jan)

Thanks,
12-05-2014 04:30 AM
onehundred
Quote:
Originally Posted by RebelRider View Post
Alright, thanks. Obviously I have an issue somewhere.
I recently fired my 5.7 LS1 up headers no O2s no MAF and I had no light. I discovered I wired it wrong. The cel wire from the computer is a ground. I wired both light wires to ground. I rewired my light. CEL wopiremto negative. ignition source to positive. Hope this helps.
12-04-2014 07:21 PM
Gemner Yeah it should come on for a second with key on, engine off. Missed that part
12-04-2014 10:52 AM
RebelRider
Quote:
Originally Posted by matts88yj View Post
When I turn the ignition on the CEL does light up. I believe it is on when cranking but as soon as it starts running it goes out.
Alright, thanks. Obviously I have an issue somewhere.
12-04-2014 10:49 AM
matts88yj
Quote:
Originally Posted by RebelRider View Post
Shouldn't it come on for just a second with just the key? I will cycle it through a couple of times and check. Thanks.
When I turn the ignition on the CEL does light up. I believe it is on when cranking but as soon as it starts running it goes out.
12-04-2014 10:31 AM
RebelRider Shouldn't it come on for just a second with just the key? I will cycle it through a couple of times and check. Thanks.
12-04-2014 09:22 AM
Gemner
Quote:
Originally Posted by RebelRider View Post
I cut down my harness using lt1swap. I recently fired up the engine for the first time with no 02 sensors or MAF. The issue I have, is the check engine indicator light is not lighting up. It doesn't even light up when I initially turn the key on? Have I wired something wrong?
The setup is out of a 2000 Gmc 2500 6.0/4L80E
Have you done it more than once? A lot of codes wont set a light until the next key cycle after the code is set. Im pretty sure O2s are that way, but it seems to me the MAF is not. Check to make sure the light works, and that you have 12V keyed on to one side of the light with the other side of the light going to the computer.
12-04-2014 07:16 AM
RebelRider 2 questions:

I'm finally trying to put together an air intake for my 6.0L. I'm using intakeshoses.com for parts. Here's the snag. Truck 5 wire MAFs are 3.8 in/3.6" out. What size boots fit these the best? 3.5" or 4"? 3.5" on the outlet and 4" on the inlet?


I cut down my harness using lt1swap. I recently fired up the engine for the first time with no 02 sensors or MAF. The issue I have, is the check engine indicator light is not lighting up. It doesn't even light up when I initially turn the key on? Have I wired something wrong?
The setup is out of a 2000 Gmc 2500 6.0/4L80E
12-01-2014 05:36 PM
waynehartwig
Quote:
Originally Posted by Boodyrider View Post
Custom os and 2 or 3 bar map yes? Been a while since I played with ls stuff but it's coming back a bit now...
yup
12-01-2014 05:33 PM
Boodyrider Custom os and 2 or 3 bar map yes? Been a while since I played with ls stuff but it's coming back a bit now...
11-30-2014 08:55 PM
waynehartwig
Quote:
Originally Posted by Soup Man View Post
So you wanna tune it?
Only on they dyno. I don't do boost through the mail.
11-30-2014 08:50 PM
Soup Man
Quote:
Originally Posted by waynehartwig View Post
Not true at all. I've done lots of boosted applications with that 99-07 LS1/Truck PCM... So have others.

02 PCM can and will read boost if tuned properly. Just like any GENIV PCM...
So you wanna tune it?
11-30-2014 06:33 PM
waynehartwig
Quote:
Originally Posted by Boodyrider View Post
02 pcm and map can't understand boost or account for it. Gen IV does, but that doesn't help you. Yes, you need full dyno tune, and yes, you can hurt the motor if it goes lean under boost... Which it will. Get thee to a dyno...
Not true at all. I've done lots of boosted applications with that 99-07 LS1/Truck PCM... So have others.

02 PCM can and will read boost if tuned properly. Just like any GENIV PCM...
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