Mk 3 Golf fast idle...
Discussion
Hi all, a little advice if you please!
I have a 1992 VW Golf Mk3 1.8 8v (90bhp). Just lately, I have noticed it seems to be idling fast. Generally between 1000 - 1200 rpm, even when the engine is fully warmed up. I'm not entirely sure how fast this engine should idle, but it can't be much more than 800 - 900 rpm.
Could somebody tell me what the idle speed actually should be? And how I might go about finding whats wrong? It's a pretty simple engine, so i'm hoping it'll be simple to fix!
I have a 1992 VW Golf Mk3 1.8 8v (90bhp). Just lately, I have noticed it seems to be idling fast. Generally between 1000 - 1200 rpm, even when the engine is fully warmed up. I'm not entirely sure how fast this engine should idle, but it can't be much more than 800 - 900 rpm.
Could somebody tell me what the idle speed actually should be? And how I might go about finding whats wrong? It's a pretty simple engine, so i'm hoping it'll be simple to fix!
The waxstat is a wax filled device that, as it warms up and the wax melts, turns on and off the autochoke - can't remember exactly how it works, but see here for some more information:
FAQ on club GTI
ISTR = I Seem to Recall
If the waxstat is rooted, it'll cause the autochoke to stay on, hence fast idle.
FAQ on club GTI
ISTR = I Seem to Recall
If the waxstat is rooted, it'll cause the autochoke to stay on, hence fast idle.
quoman said:
if its ecu related i can help!
www.ecuclinic.com
www.ecuclinic.com
Thats the problem, i'm trying to find out what might actually be causing it! With very little success so far it must be said.
I doubt it is ECU related though, given the primitive nature of the injection system.
Edited by flooritforever on Monday 26th June 22:13
has the gearbox been out recently? the main trouble with those is mechanics cant be arsed to put the earth strap back on the engine so the ecu got spiked worth checking all earthing points
www.ecuclinic.com
www.ecuclinic.com
I've a similar problem - feels like dirty jets, if it were on old-fashioned carburettor.
I'm told it's the throttle positioning control - it's a wee black box on the side of the throttle body. Looks like a complete replacement £116.00 + vat from my local VAG dealer.
ANYONE HAVE ANY OTHER IDEAS ON REPLACEMENT/REPAIR
I'm told it's the throttle positioning control - it's a wee black box on the side of the throttle body. Looks like a complete replacement £116.00 + vat from my local VAG dealer.
ANYONE HAVE ANY OTHER IDEAS ON REPLACEMENT/REPAIR
countdedown said:
I've a similar problem - feels like dirty jets, if it were on old-fashioned carburettor.
I'm told it's the throttle positioning control - it's a wee black box on the side of the throttle body. Looks like a complete replacement £116.00 + vat from my local VAG dealer.
ANYONE HAVE ANY OTHER IDEAS ON REPLACEMENT/REPAIR
I'm told it's the throttle positioning control - it's a wee black box on the side of the throttle body. Looks like a complete replacement £116.00 + vat from my local VAG dealer.
ANYONE HAVE ANY OTHER IDEAS ON REPLACEMENT/REPAIR
What year is it? Engine code would help too. If you have a connection (behind one of the swith blanks on the centre console or under the gearelver boot) get the fault code memory read by someone with either VAG com or VAG 1552 should cost £40ish and they probably will reset it too.
Bump!
Update: Local VW and Audi specialist has had a look at the car today. They reckon it's the temperature sender at fault. It appears to be reporting the engine temperature about 20 degrees C lower than it actually is. The net effect of this is that the engine is always being fueled like it is cold, hence the fast idle and the disgustingly low fuel economy I have also noticed.
They can't be 100% sure just yet because the ECU is too primitive to give them a full fault report, so keep your fingers crossed for me guys! I'll find out whether they are right tommorow!
Update: Local VW and Audi specialist has had a look at the car today. They reckon it's the temperature sender at fault. It appears to be reporting the engine temperature about 20 degrees C lower than it actually is. The net effect of this is that the engine is always being fueled like it is cold, hence the fast idle and the disgustingly low fuel economy I have also noticed.
They can't be 100% sure just yet because the ECU is too primitive to give them a full fault report, so keep your fingers crossed for me guys! I'll find out whether they are right tommorow!
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