Question about 1991 Geo Metro

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91 geo metro will start fine when cold but will not start when warm. Would injector cleaner put into fuel help?

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  • inthevine7 May 15, 2010

    Had it in the shop for tuneup,new plugs,rotor,wires,etc. New fuel reg. good spark. Now what? Seasoned mechanic could not find the prob. Also engine light goes on and off. Won't stay on long enough to diagnose prob.


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Likely not. Check it for spark when its hot. It might be an ignition module or coil problem.

Posted on May 15, 2010

  • 2 more comments 
  • Clint Smock
    Clint Smock May 15, 2010

    Hey I have another Idea. Does this have a vacuum controlled fuel pressure regulator? What engine? 3 cylinder or 4 cylinder?

  • Clint Smock
    Clint Smock May 17, 2010

    How come the bad rating???? When it won't start you are saying it has spark? If yes then it might be an ecm problem. If not check the ignition module and the coil. I can tell you how to do this. 3 cylinder?

  • inthevine7 May 17, 2010

    Did not mean to give you a bad rating, sorry for clicking on wrong things. Thank you for advising me on these things. It is a 3 cylinder and the mechanic that tested it last has all the computer stuff to check all these things but say it's running fine. This is my sister-in-law's car and I drove it yesterday and it not only has difficulty starting when it's warm but sometimes stalls when you are moving from a stop and give too much gas. It almost feels like a choke problem. In order to start it when it's warm, you need to press the pedal to the floor and hold it down, then after about many times it will finally start.

  • Clint Smock
    Clint Smock May 18, 2010

    O.K. if you have to hold it to the floor to get it started when its warm its flooded. This engine is throttle body injected. When you shut the engine off, (warm) Take off the air filter and see if the injector is leaking gas into the intake when the engine is off. Another thing you could check is the coolant temp sensor. Are you seeing black smoke from the exhaust when its running? Does it idle rough when its warm?


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REMOVAL & INSTALLATION Fig. 1: Removing injectors from fuel rail 84245032.gif
Fig. 2: Make sure injectors rotate freely in cylinder head 84245033.gif
  1. Relieve fuel system pressure and disconnect the negative battery cable.
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  14. Check if insulator is scored or damaged. If it is, replace with new one.
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