2003 GMC Serria I welded a broken muffler bracket I disconnected the neg batt cable. Now after I weled on truck it idles lower than normal. Is there something that could have be damaged from welding

Asked by BlackGMC Nov 22, 2012 at 04:17 PM about the 2003 GMC Sierra 1500HD 4 Dr SLE 4WD Crew Cab SB HD

Question type: Maintenance & Repair

When put in drive or reverse from park it will come close to dying but will stay running?

2 Answers
69,055

John answered 11 years ago

My dads 03 idles at 480-600 when warmed up depending on the humidity and air temp. What is yours idling at?

Mark helpful

BlackGMC answered 11 years ago

Ya but it use to idle higher and when you put truck under load it seems like it is too low to be normal. My wife even asked whats wrong with the truck.lol I just checked fuel pressure that comes in at 55psi and I had a 1yr warnaty on mass air flow so I replaced that. While I was there I decide to get new plugs and wires seeing that i just passed 90,000 and I having a issue.

Mark helpful

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