4.3 Backfiring on Toyota 7FGU35 - Maintenance & Troubleshooting discussion in Forkliftaction's forums

Discussion:
4.3 Backfiring on Toyota 7FGU35

Hey Team,
7FGU35/ 63108
I am at a customer location an hour away from the shop. Yesterday we got a service call, hardly runs, backfiring. Came up and found a cap on intake (part of PCV system it appears) had blown off as well. Resecured this cap, cleaned and sanded cap (2005 S10 style) since I did not stock. We have had several inches of rain lately, could have contributed I felt. Started, ran great, came home.
Got same call again this AM. Rounded up OEM cap and wires, had to match plugs and rotor from OReilly's. Just installed and test ran. Fine for a few minutes then POW! Same intake backfire. Any ideas??

Posted 4 Jan 2013 05:40
By Forkliftt
joined 13 Jul'09 - 321 messages
Louisiana, United States

Steve
steve at forkliftt dot com

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Hey gang
I had this machine brought to check out and the Spectrum LP regulator was frozen (a new symptom) and leaking as it was being unloaded. I ordered a repair kit. As I was installing it today I found that the arm that attaches to the secondary regulator valve is actually a little higher than the regulator housing. The instructions said 1/32 clearance and I assume the want it slightly lower than the housing like a model J would be. It also stated the regulator would need to be replaced if not in spec. Any ideas on this??

Posted 12 Jan 2013 09:01
By Forkliftt
joined 13 Jul'09 - 321 messages
Louisiana, United States

Steve
steve at forkliftt dot com

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Thanks R
Will give it a try.

Posted 4 Jan 2013 10:37
By Forkliftt
joined 13 Jul'09 - 321 messages
Louisiana, United States

Steve
steve at forkliftt dot com

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I have had several issues with coils on those gm engines. I usually hit them with a squirt bottle and see if there spark lost.

Posted 4 Jan 2013 10:16
By rogeriwt
joined 10 Apr'07 - 323 messages
Massachusetts, United States

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