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Old 03-17-2015, 08:35 PM   #5526 (permalink)
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I have a 2001 gm 5.3 with about 40k miles in my TJ. When the engine is cold and I give it a good blip of the throttle it wants to die out and kinda makes a backfiring noise and sputters but then after a second or two it clears up and I get full power. If you give it throttle lightly and slowly it doesn't die out. It does idle fine at all temps. Once it's good and warmed up it just about completely goes away. I was thinking maybe the MAF is bad or the intake gasket could be going. If I unplug the MAF it runs a little rougher. I also tightened up the camps for the air intake a little bit. I tried spraying some brake cleaner around the intake but never got any sputtering. There is an inline fuel pressure gauge and it stays steady right in between the 55 and 60 psi marks. I think these need 58 psi? It's not throwing any codes, even when I tried unplugging the MAF. Anyone else have some thoughts on it?

Last edited by mtmer1; 03-17-2015 at 08:44 PM.
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Old 03-19-2015, 04:02 PM   #5527 (permalink)
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Are there any snorkel kits that will accommodate an LS motor without choking it for air? The intake pipe size is so different from the 4.0L -> 5.3L it seems like a normal Jeep kit would be too small?
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Old 03-25-2015, 05:19 PM   #5528 (permalink)
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1999 5.3 from silverado 1500, 4l60e, Wayne tune with Dave's harness mods. Everything is built and done( intake exhaust blah blah)

Here's my problem. Once she is at running temperature she doesn't like idol. I haven't gotten a code checker on the OBD two port yet but I will Monday or Tuesday. Before this problem popped up today it has always idled and moved around fine but I've never had it running long enough for operating temperature. I just started it up again after it cooled down and started up and pulled into the garage with no problems at all. Anyone else I have a problem like this? Fuel pressure looks to be at the correct psi.
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Old 03-25-2015, 06:44 PM   #5529 (permalink)
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Random question for guys with 6.0L in their jeeps, do you feel its almost to much and a 5.3 would've worked just as well? I want to do a 6.0/4l80e in my CJ, but Im thinking a 5.3/4l60e to save about a grand to 1500.
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Old 03-26-2015, 03:33 AM   #5530 (permalink)
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We have 3 LS Jeeps, 2 with 6.0 and 1 with a 5.3. The 6.0's (including the LS2) are not too much. The 5.3 is fine too, it's not too little either. If you can save that much, I say go 5.3. You won't regret it. If it isn't enough for you, then you have $1500 to add more power to the 5.3
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Old 03-27-2015, 12:23 PM   #5531 (permalink)
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Are there any snorkel kits that will accommodate an LS motor without choking it for air? The intake pipe size is so different from the 4.0L -> 5.3L it seems like a normal Jeep kit would be too small?
Jeep kit would be WAY too small. Intakes for the 5.3 are 4" diameter on roughly 3" diameter opening throttle bodies. Jeep intakes are no bigger than 3" for a 56mm throttle body. That means the Jeep intake only has a bit over 60% of the open area that the GM intakes have. It would probably idle and drive just fine though, with less top end power.

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Old 03-27-2015, 02:04 PM   #5532 (permalink)
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Help with some diagnosis. Out wheeling 5.3 in Yj. Intermittant stutters, running rich and will miss. No codes. stft will get up in the 30s and dumps fuel. Can't find a vac leak. Doesn't do it till warm 190+

Has intake gaskets in the last 6 months

02 sensor replaced
Cleaned maf
Replaced fpr

Need some other suggestions.

Wayne's tune, has ran great for the last 6 months. Has upstream 02s only.
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Old 03-27-2015, 02:06 PM   #5533 (permalink)
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FP is 50, goes to 60 if I give it some fuel.
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Old 03-28-2015, 04:32 AM   #5534 (permalink)
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Help with some diagnosis. Out wheeling 5.3 in Yj. Intermittant stutters, running rich and will miss. No codes. stft will get up in the 30s and dumps fuel. Can't find a vac leak. Doesn't do it till warm 190+

Has intake gaskets in the last 6 months

02 sensor replaced
Cleaned maf
Replaced fpr

Need some other suggestions.

Wayne's tune, has ran great for the last 6 months. Has upstream 02s only.
Unmetered air from somewhere or a bad MAF.
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Old 03-30-2015, 07:51 AM   #5535 (permalink)
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So I got some good news. compression test was good in all cylinders. I pulled the plugs out grounded them and there was hardly any spark. I put a new plug in and tested the same way and what a difference. I put all new plugs in and it turned over twice and fired and ran good. I am contributing the issues to new injectors given the correct amount of fuel and the plugs not sparking enough to burn the fuel.

Fuel trims went from both being lean to both being rich which is an improvement since neither read the same before. I need to finish the exhaust and try it again. Thanks everybody for the suggestions.
So I got some time this weekend to do some more testing and here is the latest. The exhaust in pretty much together at least good enough for some testing. The motor starts and runs okay. you can here a miss fire but still no codes. The LTFT back to where I started from bank 1 @ 25.0 and bank 2 @-15.?. When I measured the temp @ the manifolds while the motor was running and they were about 150 on bank 1 and about 200-250 on bank 2. There was only one that got as hot as 300 but it was only for a min. Any other suggestions. I have tested for a head/head gasket leak into the combustion chamber and have not found leaks as of yet. I am going to take the suggestion from another post above and check to make sure that I do not have an intake leak and I am also going to clean my MAF.
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Old 03-30-2015, 08:10 AM   #5536 (permalink)
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So I got some time this weekend to do some more testing and here is the latest. The exhaust in pretty much together at least good enough for some testing. The motor starts and runs okay. you can here a miss fire but still no codes. The LTFT back to where I started from bank 1 @ 25.0 and bank 2 @-15.?. When I measured the temp @ the manifolds while the motor was running and they were about 150 on bank 1 and about 200-250 on bank 2. There was only one that got as hot as 300 but it was only for a min. Any other suggestions. I have tested for a head/head gasket leak into the combustion chamber and have not found leaks as of yet. I am going to take the suggestion from another post above and check to make sure that I do not have an intake leak and I am also going to clean my MAF.
Unplug all o2's, reset the fuel trims and try it. What are the temps on all 8 after it runs for a few mins
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Old 03-30-2015, 08:14 AM   #5537 (permalink)
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Unplug all o2's, reset the fuel trims and try it. What are the temps on all 8 after it runs for a few mins
The temps are at running coolant temp 195-205 (motor running for about 10-15 min).

So unplug them before engine starts or while motor is running? Thanks for the help.
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Old 03-30-2015, 08:34 AM   #5538 (permalink)
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The temps are at running coolant temp 195-205 (motor running for about 10-15 min).

So unplug them before engine starts or while motor is running? Thanks for the help.
Go disconnect the battery. Unplug the o2's. Hook the battery back up and start/run it for a few minutes. Then check header temps.

150 is rich or barely firing
~300 is good
4-500+ is most likely fuel burning in the exhaust from shitty plugs
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Old 03-30-2015, 09:03 AM   #5539 (permalink)
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Go disconnect the battery. Unplug the o2's. Hook the battery back up and start/run it for a few minutes. Then check header temps.

150 is rich or barely firing
~300 is good
4-500+ is most likely fuel burning in the exhaust from shitty plugs
Great I will give this a try and let you know.
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Old 04-06-2015, 09:25 AM   #5540 (permalink)
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Go disconnect the battery. Unplug the o2's. Hook the battery back up and start/run it for a few minutes. Then check header temps.

150 is rich or barely firing
~300 is good
4-500+ is most likely fuel burning in the exhaust from shitty plugs
Okay got to play with the jeep a little last night. I disconnected the battery then the o2's for about a day. I let the motor get up to temp 194* and took multiple readings at a couple different spots. First took temps at the header flange and here are the results 1-106*, 2-187*, 3-163*, 4-203*, 5-174*, 6-192*, 7-134*, 8-238*. I also measured temps at the collector bank 1-160* and bank 2-354*. So from this there is no real difference between having the o2's connected or not.

Could a bad intake gasket cause the motor to run like this? Thanks again for help.
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Old 04-20-2015, 05:59 AM   #5541 (permalink)
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How are you guys venting your fuel system?
I have an RCI tank, a send line & a return line, and no vent.
This build pressure in the tank and (I suspect) causes a high idle sometimes.
Just a rollover valve? Anyone using a charcoal canister for vapor smell?
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Old 04-20-2015, 06:44 AM   #5542 (permalink)
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I used the purge solenoid from the engine donor rig (03 Tahoe) and an OEM ( 00-01 XJ) vapor canister.
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Old 04-20-2015, 10:55 AM   #5543 (permalink)
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I used the purge solenoid from the engine donor rig (03 Tahoe) and an OEM ( 00-01 XJ) vapor canister.
Do you run the 'pin 64 - Fuel Tank Pressure Sensor Signal' to control that then?
Is your system at pressure unless the ECM is controlling that solenoid, or do you have any other means of vent? gas cap or whatever...
Thanks.
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Old 04-20-2015, 11:15 AM   #5544 (permalink)
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Mine isn't vented anywhere both tank vents are connected together. I have zero problems with this setup.
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Old 04-27-2015, 01:48 AM   #5545 (permalink)
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C6 Corvette Manifold

Couple of questions for all you super smart LS people out there.
-What year C6 Corvette should I be looking for to score some manifolds from?
-Will those manifolds work with factory style GM Engine mounts? I would assume they would?
In case anyone was wondering I am installing an LS3 With a NV4500 into a JK and I am having a bit of a clearance issue with the slave cylinder and where the manifold dropout is. Any help would be great Thank you
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Old 04-27-2015, 07:27 AM   #5546 (permalink)
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Couple of questions for all you super smart LS people out there.
-What year C6 Corvette should I be looking for to score some manifolds from?
-Will those manifolds work with factory style GM Engine mounts? I would assume they would?
In case anyone was wondering I am installing an LS3 With a NV4500 into a JK and I am having a bit of a clearance issue with the slave cylinder and where the manifold dropout is. Any help would be great Thank you
Im not sure what year these manifolds came off of. The ones that I am using are off a LS3 crate motor, found on ebay for like 200 bucks w/ heat sheilds. Here is a set I just found on ebay

Corvette C 6 Exhaust Manifolds and Collector Flange | eBay

as far as mounts go I am using them with novak motor mounts and they clear (pretty close but clear). Sorry cant comment on the other questions.
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Old 04-27-2015, 08:19 AM   #5547 (permalink)
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Mine isn't vented anywhere both tank vents are connected together. I have zero problems with this setup.
I don't recommend this. Is your fuel cap at least vented to let air in (and not out)? It has to be, or you have a leak somewhere that you don't know about. You can't seal a fuel tank. Air needs a way in to replace the fuel that is removed.
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Old 04-27-2015, 10:30 AM   #5548 (permalink)
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Just thought I'd ask, I'm getting ready to install a speedometer into my rig. There's nothing to adapt to that's vehicle related so I've turned to an aftermarket type. Given I have a signal wire from computer labeled "4k", done by Jims Performance, what sort of electric speedo gauge should I look for?
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Old 04-27-2015, 12:11 PM   #5549 (permalink)
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I don't recommend this. Is your fuel cap at least vented to let air in (and not out)? It has to be, or you have a leak somewhere that you don't know about. You can't seal a fuel tank. Air needs a way in to replace the fuel that is removed.
Vented cap.
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Old 04-27-2015, 12:13 PM   #5550 (permalink)
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Couple of questions for all you super smart LS people out there.
-What year C6 Corvette should I be looking for to score some manifolds from?
-Will those manifolds work with factory style GM Engine mounts? I would assume they would?
In case anyone was wondering I am installing an LS3 With a NV4500 into a JK and I am having a bit of a clearance issue with the slave cylinder and where the manifold dropout is. Any help would be great Thank you
I found C6 manifolds hit my engine mounts, Novak.

Camaro are much better, they hug the block and dump out straight down at the back.
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