Question about 1987 Volkswagen Cabriolet

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Engine idles up and down

Hi , my husband just rebuilt a 1.8 cis for my cabriolet and when he starts it up it has a couple of issues 1st it won't start by the key so we put a new starter on it same thing we put a new key switch same thing and when it idles it idles fast then slow . He pulled off a vaccum hose off of one of the sensors and it would idle fine but we're not sure what the sensors are or what they are called to see about replacing them. I hope you can help

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Most likely it was the egr valve or the Iac valve that your talking about. however you might want to check to make sure the throttle adjustment if it is carburated or the tps sensor if it's fuel injected.please rate this solution. thanks

Posted on Aug 29, 2008

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The problem is in your carburator. Was it rebuilt in a shop or by yourself or a friend?Did they know what it was going on? It could be that the float level is too low. It could be that you have the plunger rod for the power valve in the wrong hole. It could be that you just need to adjust the mixture screws on the front. I would start with the mixture screws. Turn them in until they seat but don't force them,be gentle. Turn them out 1 and 1/4 turns each and start from there. You will have to turn each one separately from here.Set your curb idle about 500 RPM and turn 1 screw out until you hear the idle start to go up and then back it off until it starts to falter or miss, them come ahead just enough to bring the engine out of that. Then do the same with the other screw. Reset your idle and rev the engine by hand, a couple of cracks and then crack the 4 barrels open and let go. If it stalls then open the idle screws about 1/8 turn and try again. When the engine will return to idle off the 4 barrels without stalling your mixture screws are set right. Make sure you keep resetting the curb idle, usually 500RPM for a standard and 750 RPM for an automatic.
If you rebuilt the carb yourself then look on the rebuild sheet that came with the kit for your engine application and make sure you have the power rod in the right hole and that you have the correct float level. Different applications have different float levels even with the same size engine. Set them for the engine you have it on, if the carb came off something else. Hope this helps.

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My 87 Cabriolet doesn't want to start (but it will pop-start). It also stalls a lot; it seems to have something to do with whatever it is under the back seat (fuel relay?), which starts to hum as the...


If you car wont crank start I dont think the fuel system is the culprit.

You probably have a sensor issue that starting the vehicle in motion overcomes.

You should see about having the engines diagnostic codes read and see if any sensors are out of range or stuck.

It sounds like an idle air control valve or throttle position sensor has gone bad *(perhaps both?)

Be safe and good luck!

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http://home.hiwaay.net/~langford/CIS.html

check this out and see if it helps. It sounds like you are priming the psi up when cranking then it can go. but when you let it sit the pressure drops and has to build up again. I a not a VW person myself but love tinkering, so let me know how it goes.

tepfy

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Note that all cars don't have the same symptoms as stated in the following procedure to cure your problem.
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