Hello, would appreciate any advice you can offer. Bought this GTI not running well. Changed plugs, wires, cap/rotor/fuel filter, timing belt, engine oil/filter, coolant, cold start regulator (on front), and she starts right up, but is very slow to rev and bogs down at full throttle. I have checked fuel pressure at fuel distributor and it is 50psi with valve open and reaches 72 psi with valve closed. Ignition timing is correct. Compression test shows 150 - 170 psi across all 4 cylinders. Yet, revs remain slow and top rpm under load is 3,000. As car warms up, seems to get worse. Have I got a fuel problem, plugged cat., or something else??? Thanks for your help!
1984 GTI Running Problems - Fuel CSI?
callawaygticab
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Hello, would appreciate any advice you can offer. Bought this GTI not running well. Changed plugs, wires, cap/rotor/fuel filter, timing belt, engine oil/filter, coolant, cold start regulator (on front), and she starts right up, but is very slow to rev and bogs down at full throttle. I have checked fuel pressure at fuel distributor and it is 50psi with valve open and reaches 72 psi with valve closed. Ignition timing is correct. Compression test shows 150 - 170 psi across all 4 cylinders. Yet, revs remain slow and top rpm under load is 3,000. As car warms up, seems to get worse. Have I got a fuel problem, plugged cat., or something else??? Thanks for your help!
Re: 1984 GTI Running Problems - Fuel CSI? (callawaygticab)
When I first got my GTI, I noticed under the hood that something electrical was unpluged behind the intake manifold, right beside the RF strut. It was an orange looking plug. When I pluged it back in...My GTI pretty much did what your saying. So I unpluged that wire conection and it runs absoluetly fine. I have no idea what that wire is, but now I see it was unpluged for a reason...
I doubt that is a plugged cat converter, although its possible. My GTI had 168,000 miles on it before I cut the Stock Converter off and It wasn't plugged...you could see daylight through the ceramic catalyst. I just took mine off to be sure...even though it ran absolutely fine with it on.
When I first got my GTI, I noticed under the hood that something electrical was unpluged behind the intake manifold, right beside the RF strut. It was an orange looking plug. When I pluged it back in...My GTI pretty much did what your saying. So I unpluged that wire conection and it runs absoluetly fine. I have no idea what that wire is, but now I see it was unpluged for a reason...
I doubt that is a plugged cat converter, although its possible. My GTI had 168,000 miles on it before I cut the Stock Converter off and It wasn't plugged...you could see daylight through the ceramic catalyst. I just took mine off to be sure...even though it ran absolutely fine with it on.
I think that little plug is for the 02 sensor, try unplugging it and see what happens. Both my CIS cars had weird 02 system problems, you can maybe narrow it down. In later years both my '82 and '83 would run about perfect with the 02 sensors unplugged, the brains or something would die at near 200k miles.
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Re: 1984 GTI Running Problems - Fuel CSI? (scott0250)
Thanks for the idea, but undoing the O2 sensor plug made no difference. Any other ideas would be helpful! Thanks.
Thanks for the idea, but undoing the O2 sensor plug made no difference. Any other ideas would be helpful! Thanks.
Re: 1984 GTI Running Problems - Fuel CSI? (callawaygticab)
Hi, seeing as how you made no mention of the injectors, I would have to agree with Moljinar. I think the cheapest (and on the A1 forum we like cheap) next step would be to clean those bad boys. If you are unsure on the best way to do this.. search can be your best friend. Let us know how it goes.
All the best
Jeff
Hi, seeing as how you made no mention of the injectors, I would have to agree with Moljinar. I think the cheapest (and on the A1 forum we like cheap) next step would be to clean those bad boys. If you are unsure on the best way to do this.. search can be your best friend. Let us know how it goes.
All the best
Jeff
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