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VW Cabriolet RPM decreases

I have a Manual 1.8 VW cabriolet 1988. My car starts and drive great but after a while, usually after driving for few miles at high or low speed... the rpm get low and it seems the engine wants to turn off. sometimes I just switch the engine to off and started again and the problem disappear or sometimes after ignoring it by driving, it stop doing it but after a while it happens again. Might be a dirty injector? fuel pump? low oxygen?? please help. Normally 2000 RPM, when having problems it get to 1000 RPM

Posted by Adel H Mohammad on


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k spencer

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Hi, it sounds like you have dirt, water ,gunk & grime in your inline factory fuel filter ,.Its located between the tank & the inlet manifold,.
once you located, have it changed it, or have it changed, (its a steel canister with flow arrow) ,check for lacquer peel, which is a sealant they sometimes use in fuel tanks, check contents of old canister by pouring remainder into a container and check for this, it will be flacky particals, if severe, have tank tanken out of car & cleaned, this is due to not having the tank full most the time, Also, check your air cleaner , it will help with the cars performance. hope this helps, Kipper VW Cabriolet RPM decreases - 25257603-fhf2ppg4i12i45qd5vaymkeg-2-0.jpgmake sure arrow on filter face front of car....

Posted on Oct 27, 2014

Testimonial: "Thankyou K spenser!. Not long time ago I change it, but I'll do it again.I forget to say that when turning A/C on the motor do something similar to what i said. but impossible to drive it, it will shut down the engine."

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  • k spencer
    k spencer Oct 27, 2014

    is the car a air aspirated ( carburetor) or throttle body? if throttle body, take off air intake hose and with the engine running, rev the engine hard ( afer car is at normal running temp), or it could be a map sensor, or another sensor, . honestly it could be nurmerous thing to say the least, but would be grat to help you out & save some $$$.Thanks, Kipper

  • k spencer
    k spencer Oct 27, 2014

    sorry, i forgot to say, sray ''throttle body cleaner in the inlet, its about $10 per can here ( Australia) you will need someone to spray at intervals and rev engine, the engine will want to die, stop spraying, for a moment, the rev car hard again, until can is empty, you'll get the idea, conect up the air intake hose & see if any better.

  • k spencer
    k spencer Oct 27, 2014

    Add a CommentLet me knoe how you get on. Thanks Kipp



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to me its sounds as though you have dirt ,gunk & grime ,water, in the main inline factory fuel filter, ,it will be a steel canister type, between the feul tank and the intake manifold, change filter,( u may need a mechanic, or someone handy with a spanner, once off, tip contents into and look for laquer peel, some tanks are seal with this, and it will some times peel ( especially if tank not kept full). if that is the case, have your tank taken out & cleaned, also, check airfilter, car will run better n cheaper to run, Hope this Helps. Kipper

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