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Corsa Sport » Message Board » Help Zone, Modification and ICE Advice » Problem after exhaust being welded, low power, eats spark plugs » Post Reply

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Cossie	posted on 30th Jun 08 at 20:35
	btw it is not the ecu only the problem but there is the alternator diodes that are damaged by welding
Dave A	posted on 30th Jun 08 at 20:11
	Whenever you weld on a car you should disconnect either the battery or ECU. if you dont disconnect the ecu you must use a battery isolator to protect the ecu as it is still connected to the chassis earth system. My Isolator cost me about 25 quid and gets used most days in the workshop.
Vaux Lad	posted on 30th Jun 08 at 19:35
	quote: Originally posted by Dave A really? its one of the first things I learned back in 1995 in technical college at Ford. Yep. I always disconnect them when doing welding myself, but garages like cutting corners.
Cossie	posted on 30th Jun 08 at 18:37
	I tried to search for this battery clamp everywhere but could not find one ,could be very handy when welding I don't think it cost to much
Will94	posted on 30th Jun 08 at 18:25
	This might explain some of my engine running issues... which coming to think of it started aroudn the same time i began the major chassis repairs :lol:
sand-eel	posted on 30th Jun 08 at 18:22
	thats weird, every car i've seen welded has the battery disconnected.
VegasPhil	posted on 30th Jun 08 at 18:14
	They always clamp something onto my battery when it's being welded.
Joe	posted on 30th Jun 08 at 18:14
	You sure its not just a missfire caused by something else and its not just coincidence that it has gone fucked just after the work?
Cossie	posted on 30th Jun 08 at 18:10
	By disconnecting the battery is useless i was reading few weeks ago as still ecu is earthed to chassis a special device must be connected to the battery
Dave A	posted on 30th Jun 08 at 18:09
	really? its one of the first things I learned back in 1995 in technical college at Ford.
Vaux Lad	posted on 30th Jun 08 at 16:26
	Garages doing welding never disconnect the battery or ecu. Ive never seen one do it anyway
Dave A	posted on 30th Jun 08 at 15:50
	quote: Originally posted by Cheese Man Chris If this the case whats usally damaged? It cant be the ECU? Can it? :boggle: sounds EXACTLY like an ecu damaged by welding. why didnt the garage doing it disconnect the battery or the ecu?
Dean_W	posted on 30th Jun 08 at 15:46
	I'd be going back and telling them to cough up!
Richardhhha	posted on 30th Jun 08 at 15:28
	looking that way mate, looks like its spiked the ecu pritty bad. Always disconect the ecu and bat if posebel(sp) when doing welding
Cheese Man Chris	posted on 30th Jun 08 at 13:35
	If this the case whats usally damaged? It cant be the ECU? Can it? :boggle:
Dave A	posted on 30th Jun 08 at 12:30
	sounds like a typical problem caused by earthing a welder through the chassis and not using a battery isolator or disconnecting the ecu.
Cheese Man Chris	posted on 30th Jun 08 at 11:29
	The car with the problems here is an astra G, posting on behalf of a friend. Problem started when i had a new flexi joint welded in my exhaust. The guy from the garage that did the work, didnt disconnect the battery... Since then, it had a bad misfire, I changed the plugs and the coil pack because the plugs were burnt out, changed them they were shit hot, now the problems returned, but its not a misfire its more a lack of power, but i have changed the plugs yet again since because they were burnt out. Could it be the welding has caused some damage somehwere? Any advice or knowledge please help. Thanks [Edited on 30-06-2008 by Cheese Man Chris]