Replaced plugs, Checked hoses for leaks, checked airfilter, Runs fine idles fine but just started dieing. There are no wanring or fault lights,
when at lights or stopped it cuts out but runs fine when driving and i dont think my fan comes on when sat waiting with it running
Being a certified mechanic has its advantages. there are multiple causes for that problem: lack of air or lack of fuel.
make sure the air filter is mostly clean.
check throttle plate (where air filter tube goes into motor), most likely black with soot and carbon. clean with tooth brush and gas, wipe off with clean rag. repeat ultil CLEAN.
low air flow past plate when closed (idle) will cause stall condition.
dirty throttle body is a common problem with lots of cars. causes engine stall.
dirty fuel filter will also cause this problem.. low fuel pressure at idle.
I also believe that your car is equipped with an idle air control valve. (regulates a bypassed air flow to motor at idle) this valve may be stopped up or non-functional. have local shop take a look, but there are ways to check valve if you consider yourself mechanically inclined
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As with any no-start or stall problem you will need to figure out if it is a fuel or ignition issue. The high idle usually means you have a vac leak or a problem with the throttle body or idle air control valve. The control valve is how the computer controls the idle speed. You'll need to watch the fuel system and spark to see which is being affected when the engine dies. You might want to hook a test light up to the coil to see if it is loosing voltage for example.
You may have to dig deeper for a vacuum leak. It's possibly the intake manifold gasket. Try spraying some starting fluid around the intake manifold. Also try disconnecting the brake booster and plugging that hose, the diaphram in the booster could be ruptured, causing a vacuum leak. Check the PCV valve and hose too.
Couple of options here. If it only dies when you have your foot on the brakes, then it's probably a vacuum leak on your brake master cylinder, It is a large hose running from back of intake to brake booster, with a plastic fitting for the hose to slide on. If you hear a hiss when you apply the brakes, that's definately it.
other than that it would have to be some kind of idle problem. If the car sits and idles fine then check the hose. Hope this helps :)
Check your vacuum lines, make sure there is no leaks, and go from there, then all you electrical connection in the engine compartment.
I have a 1996 Jetta Trek Edition, the hoses, and wire harness, are so brittle, any movement can cause hoses and wire insulation to crack.
I have a similar problem with one of my Toyota Corollas. It's a 95 model with the 1.8L engine (7A-FE, automatic). But unlike yours, it has plenty of power while running. Here's what it does. Occasionally the engine misses. Sometimes it will die. This is most likely to happen when you start the car and put it in reverse and start rolling without giving the engine time to adjust. I've been told by some customers that it will die sometimes when coming to a stop. But this has never happened when I drive it. I don't think it's a fuel issue because the car runs just fine when it's running.
Here's what I've tried so far:
Replaced spark plugs and wires.
Used gasoline additive fuel injector cleaner.
Checked air filter.
Checked vacuum hoses for leaks.
Replaced PCV valve and hoses.
Cleaned the air intake and throttle body with carburetor cleaner.
So far there is no change in the problem.
What I plan to do next:
Check the throttle position sensor.
Check the MAF sensor.
Adjust the idle via the set screw.
After that I have no idea what to do next if the problem persists. The check engine light is not on so I don't think there are any error codes. Will let you know.
this is usually a bent throttle stop caused by people flicking the foot off the accelerator pedal , just bend it back to origional position , hope this helps
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