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    Thread: Cis-e 1987 jetta wont idle or rev

    1. 09-12-2020 01:15 AM #1
      I bought an 87 Jetta gli with cis-e fuel injection system. I wanted a project car to learn how to work on cars. Despite my lack of knowledge I still bought the car even though it doesn't idle. but I'm determined. anyways when I bought the car I could step on the gas and keep the engine running until it was warm and then it would idle. so on a cold start the engine won't rev. I decided to replace the fuel distributor and differential pressure regulator to see if anything would happen, but no. however after doing that I noticed I could no longer rev the engine anymore. instead now when I step on the gas it kills the car automatically.

      So I went gun-ho and replaced everything from the fuel pump all the way to the injectors. so a new
      Fuel pump
      fuel reservoir housing
      pressure regulator
      fuel distributor
      differential pressure regulator
      idle air stabilizer
      cold start injector
      thermo time switch and
      coolant temperature switch

      still nothing

      then for some reason I decided to check the spark plugs and noticed that they were carbon deposits on them and they smelled like fuel. so I cleaned them lightly, again nothing. then I decided to replace the spark plug wires. after that the car would idle but its super rough. but it takes a couple tries to get it to actually idle.

      I need to check for vacuum leaks but its hard cause it won't idle, and when I bought it the guy initially said it was a fuel issue which is why I went all in with the fuel system replacements. The only thing I really haven't done is check the fuel pressure and adjust the idle/fuel ratio, but I'm super green at dong this type of stuff. so I want to get it done but because of lack of knowledge I'm in a rut. Anyone know what could possibly be the problem. I mean I only coming to the forums because it seems like the best place to go to for help. Would appreciate any suggestions.

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    3. Member
      Join Date
      Jan 31st, 2001
      09-12-2020 10:51 AM #2
      First thing I would recommend is to stop replacing parts because you think they are bad. This rarely ever works but seems to be the first tactic people use.

      All the air must be metered so the fuel system can deliver the right amount. Smoke testing the intake system is the best/only way to know if you have any air leaks. Most people do not have a tester but it's worth the money if you are a pro. It's worth your money to find someone that can do that on your engine.

      By changing the fuel distributor, usually you have to tweak the CO screw to set it up correctly.

      Ignition timing needs to be checked and adjusted to specs.

    4. Member
      Join Date
      Nov 4th, 2017
      09-15-2020 10:48 PM #3
      do you have fresh premium gas?

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    6. Member
      Join Date
      Dec 22nd, 2016
      09-17-2020 02:43 PM #4
      blowing cigarette smoke through a vacuum line is very effective when looking for leaks

    7. Member
      Join Date
      Dec 22nd, 2016
      09-17-2020 02:44 PM #5
      Quote Originally Posted by garryt View Post
      blowing cigarette smoke through a vacuum line is very effective when looking for leaks
      disclaimer- of course I don't encourage smoking!

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