Idle surge and stall after header install - Hemi Truck Club
 
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Old 10-16-2018, 01:38 PM   #1
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Idle surge and stall after header install

I have a 2003 Dodge Ram 1500 with the 5.7 hemi. I installed a 273 comp cam in it a year ago and lifters, valve springs, etc. I got it tuned and it’s been running great. I just installed a set of pacesetter long tube headers and it ran good when I first started it and then it started surging. I then realized I had the o2 wires crossed that I had to extend so I fixed that and it ran fine again until I made it a little ways down the road then it fouled out plugs and was stalling and still surging at idle and lost all throttle response. I’m totally lost now. I need some help lol.

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Old 10-16-2018, 02:09 PM   #2
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Welcome to the forum. 03's are especially welcomed ...
This sounds like a 02s problem. Are you getting any codes? When you extended the sendor wire, did you splice it or use an extension wire?. Are you using oem sensors?
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Old 10-16-2018, 02:27 PM   #3
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It’s only throwing a code that says system too lean. And that’s what I’ve been told I just replaced them and I spliced the downstream one with the wire they gave me with the headers. The upstream was not extended
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Old 10-16-2018, 03:45 PM   #4
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I know it's probably not the answer you want, but you should get rid of the 03 PCM and swap it for a 2005 PCM. You will be able to run two upstream sensors and then just tune out the downstream sensors. This would also open up much more tuning capabilities for future modifications.
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Old 10-16-2018, 04:53 PM   #5
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The 03 pcm has two conditions open loop (cold condition) and closed loop (warmed up condition). In the closed loop condition the upstream o2s reads the exhaust and sends it's signal to the pcm to control the air fuel mixture. (14.7 ideal). The down stream is used to test the cat effectiveness and does not control air fuel. The 03 o2s can be installed in either side of the LT header collector and does fine reading only one side. Any exhuast leaks can cause tuning problems and must be eliminated.
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Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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Old 10-16-2018, 05:59 PM   #6
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Quote:
Originally Posted by TYSENUS View Post
I know it's probably not the answer you want, but you should get rid of the 03 PCM and swap it for a 2005 PCM. You will be able to run two upstream sensors and then just tune out the downstream sensors. This would also open up much more tuning capabilities for future modifications.
Idk how to do that and I know I should but I’ve already got it tuned for the cam and it’s been running great. All I did was put headers. You shouldn’t need any kind of tune for that?
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Old 10-16-2018, 06:02 PM   #7
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The 03 pcm has two conditions open loop (cold condition) and closed loop (warmed up condition). In the closed loop condition the upstream o2s reads the exhaust and sends it's signal to the pcm to control the air fuel mixture. (14.7 ideal). The down stream is used to test the cat effectiveness and does not control air fuel. The 03 o2s can be installed in either side of the LT header collector and does fine reading only one side. Any exhuast leaks can cause tuning problems and must be eliminated.
There are no exhaust leaks at the moment (knock on wood). Both o2s are working properly. And I just got done replacing all spark plugs cuz they were fouled out from when it used to flood and it didn’t change anything.
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Old 10-16-2018, 06:10 PM   #8
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It definetly sounds like an oxegyn sensor issue, I had similiar. If the truck start up and runs fine, then stalls out, try unhooking the battery for 10-15 seconds. If it goes back to running fine for a few minutes it’s definetly an upstream sensor issue. I’m really surprised you got the 273 to run fine on the 03 pcm, that’s a pretty decent size cam
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Old 10-16-2018, 06:18 PM   #9
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It definetly sounds like an oxegyn sensor issue, I had similiar. If the truck start up and runs fine, then stalls out, try unhooking the battery for 10-15 seconds. If it goes back to running fine for a few minutes it’s definetly an upstream sensor issue. I’m really surprised you got the 273 to run fine on the 03 pcm, that’s a pretty decent size cam
Yeah everyone said it was impossible but Hemifever tuning wrote my tunes and got it going. He quit doing anything under 05 now tho. And now it doesn’t even start up and run good. I start it and it immediately starts surging.
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Old 10-16-2018, 06:44 PM   #10
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Hemifever, should still honor his tune. But if he doesn't we have Keith who has done magic on 03's. What do you have your idle set at?
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6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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