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03-16-2017, 09:05 PM
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#1 |
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Registered User
Join Date: Mar 2017
Location: Providence Forge
Posts: 9
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5.3l swap popping
I recently i swapped my old 350 for a 5.3l LS. Took me months to do this. A few weekends ago it was time to turn the key to see what i had. And when i finally got the nerve to do so, my motor just pops back through the intake. I put my scanner on it and it gave me a code for "crankshaft sensor". Replaced it and still did the same thing. Can anyone out the there tell me what the problem is?
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03-17-2017, 06:27 AM
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#2 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: 5.3l swap popping
Welcome to the site. I've never done an LS swap and not real big on computer controlled servicing, but it sounds like one component isn't talking to the other. Something is either not connected properly, wiring issue, other bad component. There is an LS swap message board where I'm sure you'll find your best answers.
What did you do with that Olds 350?
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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03-17-2017, 06:40 AM
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#3 | |
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Registered User
Join Date: Mar 2017
Location: Providence Forge
Posts: 9
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Re: 5.3l swap popping
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03-17-2017, 12:37 PM
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#4 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 5.3l swap popping
If you replaced the sensor and it didn't help, trace the wires carefully to make sure they didn't get knicked/cut/pinched/etc somewhere.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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03-17-2017, 02:57 PM
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#5 |
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Registered User
Join Date: Jun 2015
Location: Indanapolis, IN
Posts: 603
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Re: 5.3l swap popping
I don't remember the details but I seem to recall having to do some type of "crank relearn"
Try searching for that. |
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03-17-2017, 06:00 PM
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#6 |
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Registered User
Join Date: Feb 2015
Location: Phoenix Arizona
Posts: 122
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Re: 5.3l swap popping
Does the engine turn over smoothly when cranking, besides the popping of course
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03-17-2017, 06:16 PM
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#7 |
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Registered User
 
Join Date: Jan 2012
Location: Whitesboro, Texas
Posts: 932
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Re: 5.3l swap popping
Double check your coil pack harness. Sounds like you may one or both backwards.
passenger side from front back 2 - pink/red/brown/black 4 - pink/green 6 - pink/blue 8 - pink/purple driver side from front to back 1- pink/purple 3 - pink/blue 5 - pink/green 7 - pink/red
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Cheers - Wayne Our Shop Build - http://67-72chevytrucks.com/vboard/s...d.php?t=620966 '55 Wagon Build - http://67-72chevytrucks.com/vboard/s...d.php?t=689157 1971 Cheyenne Super Ochre/White LWB 350 Auto - my son's truck "Nancy" 1972 GMC K2500 Custom 4X4 Olive LWB 400 SB 4-speed -"Greenie" - Restoration to begin after the '55 Nothing sucks more than that moment during an argument when you realize you're wrong. |
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03-17-2017, 06:25 PM
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#8 | |
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Registered User
Join Date: Feb 2015
Location: Phoenix Arizona
Posts: 122
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Re: 5.3l swap popping
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03-17-2017, 07:54 PM
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#9 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 5.3l swap popping
Did you do any internal engine work, or is this a stock pullout?
If you end up chasing a solution, you may consider a CASE relearn. This is what was being alluded to earlier. When you put a new crank sensor in, the ECM may need this done. It basically recalibrates the sensor and ECM to the crank angle sensor, and its relationship/phase with the cam sensors. If you did a cam swap, its also very possible. The downside is that CASE relearns require command-access to the the ECM, so thats something like HPT, a TechII/III or other full feature scanner/control.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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03-18-2017, 12:38 PM
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#10 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 5.3l swap popping
But doesn't a crank sensor alignment (or CASE, whatever) require the engine be running before they do it? So it can't be the cause of a no-run, if that's the case...
Given this sounds so much like a distributor issue (and there's no distributor) I'm leaning towards the coil pack myself as others said... we shall see what the owner says!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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03-18-2017, 02:01 PM
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#11 |
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Post Whore
 
Join Date: May 2015
Location: Alabama
Posts: 14,671
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Re: 5.3l swap popping
I'm with daddyo..when I got my engine running it had a backfire/miss to it and a couple of cold header tubes on the drivers side..I looked at the coil pack harness and it looked ok..but I also went and looked at my new trucks harness and sure enough the coil packs were wired backwards..simple swap and it ran like a charm..
Last edited by mongocanfly; 03-18-2017 at 03:46 PM. |
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03-18-2017, 03:00 PM
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#12 | |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 5.3l swap popping
Quote:
Get the coil packs wrong and all bets are off though!
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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03-18-2017, 03:42 PM
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#13 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,671
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Re: 5.3l swap popping
Dogonit..your right ..I meant coil packs..sorry..I fixed my above post..thanks for pointing it out
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03-18-2017, 07:02 PM
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#14 | |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 5.3l swap popping
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING |
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03-19-2017, 03:58 PM
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#15 |
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Registered User
Join Date: Mar 2017
Location: Providence Forge
Posts: 9
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Re: 5.3l swap popping
Sorry fella long weekend. The truck is at the shop right now getting exhaust done on it right now. I will go through it this week and let you guys know what i found. And thanks for all the comments.
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03-19-2017, 04:00 PM
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#16 | |
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Registered User
Join Date: Mar 2017
Location: Providence Forge
Posts: 9
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Re: 5.3l swap popping
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03-19-2017, 04:03 PM
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#17 | |
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Registered User
Join Date: Mar 2017
Location: Providence Forge
Posts: 9
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Re: 5.3l swap popping
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03-19-2017, 05:52 PM
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#18 |
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Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: 5.3l swap popping
Did you service, clean the injectors, if it was sitting for a long time.
How is the fuel pressure?
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03-19-2017, 08:43 PM
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#19 |
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Registered User
Join Date: Feb 2015
Location: Phoenix Arizona
Posts: 122
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Re: 5.3l swap popping
if it sounds like it wants to start but is popping, I would double check that the map sensor is reading correctly. I had an issue similar to yours, and it turned out to be the map sensor always reading 100kpa
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03-27-2017, 01:53 PM
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#20 |
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Registered User
Join Date: Mar 2017
Location: Providence Forge
Posts: 9
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Re: 5.3l swap popping
Guys i just want to thank you all for your help. I had the coil harness on the wrong sides. Lol she is definitely running now.
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03-27-2017, 03:37 PM
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#21 | |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 5.3l swap popping
Quote:
 
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING |
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03-27-2017, 03:57 PM
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#22 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,671
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Re: 5.3l swap popping
glad ya got it fixed..
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