stalling k-jetronic 1.8i engine
Discussion
Wonder if anybody can help me. Problem with my scirocco K-Jet 1.8i. It stalls after a couple mins running. Restarts no problem but stalls again after a couple of minutes. Starts then stalls......
Plenty fuel and spark. Changed distributor (whole unit), ignition switch, ignition coil and fuel filter. Awaiting ignition module but told they either work or don't. Not holding much hope.
Plenty fuel and spark. Changed distributor (whole unit), ignition switch, ignition coil and fuel filter. Awaiting ignition module but told they either work or don't. Not holding much hope.
coddie said:
Wonder if anybody can help me. Problem with my scirocco K-Jet 1.8i. It stalls after a couple mins running. Restarts no problem but stalls again after a couple of minutes. Starts then stalls......
Plenty fuel and spark. Changed distributor (whole unit), ignition switch, ignition coil and fuel filter. Awaiting ignition module but told they either work or don't. Not holding much hope.
OK Coddie,
Your car is an '87 which means it could be one of two variants. It has either a rotary idle valve to continuously control the idle speed, or it has an auxiliary air valve to give you extra air and hence increased idle when warming up, plus a couple of vacuum switches that advance the timing up slightly which in turn raises the idle speed to compensate for alternator load when things like the cooling fan or the headlights are switched on.
Both of these systems though are dependent on the inlet manifold and hoses having absolute integrity; you must check every hose and the main bellows and make sure they're tight and not perished, coz if it draws air at these it will stall.
If you have the air valve system make sure the mixture's not too lean; MOT testers are the world's worst for this.
They adjust a K-Jet system to get it within the emission limit by just screwing in the fuel meter adjuster and do nothing else, and of course the car is running too lean and keeps on stalling. To adjust this you need a special long allen key.
If you have a rotary air valve system, take the valve out, it's on the top of the inlet manifold at the rear, big, round cylinder with a multiplug at the end, and clean it thoroughly with some carb or brake cleaner and that should help.
If you find it's full of oil from the breather system, 9 times out of 10 you've found the problem.
Both these systems however have a manual adjusting screw to set the basic idle speed up; it's on the throttle body in a small recess and requires a long electrical screwdriver to adjust.
Clockwise will slow the idle speed, anti-clock will increase it.
Let me know how you get on.
Will explain a little further. In the beginning........Noticed the rev counter kept dropping suddenly, but nothing happened with the car's performance. Problem began when the car cut out and would not start. The relay had blown. Replaced the relay and coil, cleaned the air filter. The car ran for a couple of days before cutting. Replaced the fuel filter, old one was black (original?), ran for a little while then kept stalling, every 5 mins or so. Replaced the distributor, ran for 20mins then stalled. Checked to see if there was spark and fuel, there's plenty. Changed the ignition switch, no difference.
Tried wiring the ignition direct to the battery, car still cuts out. It suddenly loses it's spark then stalls. Makes me think it is an electrical fault, somewhere!
I checked the air valve and hoses. They seem fine, tight and clean. The car was MOT'd in June so not really wanting to tamper with mixture.
Tried wiring the ignition direct to the battery, car still cuts out. It suddenly loses it's spark then stalls. Makes me think it is an electrical fault, somewhere!
I checked the air valve and hoses. They seem fine, tight and clean. The car was MOT'd in June so not really wanting to tamper with mixture.
www.gvk-motorsport.co.uk/
Photo guide down the bottom on there mate. Sorted mine in about 30 minutes (used petrol to clean the ISV).
Photo guide down the bottom on there mate. Sorted mine in about 30 minutes (used petrol to clean the ISV).
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