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Old 09-10-2010, 11:55 PM   #1 (permalink)
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Default Sierra Engine Problems

Hello all I have been having a large number of Engine problems with my 1991 Model Suzuki Sierra..
At the moment when I change the revs of the engine gradually higher, the revs reach a certain point that if I hold the revs steadily there. The engine will cough and gradually the engine will just drop revs and shut off?

I have a new fuel pump, New Leads, I cleaned out the Fuel Injectors (Covered air intake with hand until engine struggles than increase revs for 10-15 seconds a few times apparently this works?), I have also checked for leaks in the air intake but there are none.

Apart from this one little choke throughout the entire Rev Range it runs perfectly. After replacing the Leads and Fuel Pump it runs awesome. This problem makes it extremely hard to start the car moving from a stand still...

I am soon going to Replace the fuel filter and all the spark plugs. But what else could be the problem?
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Old 09-11-2010, 07:03 AM   #2 (permalink)
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I'd start with a full service including new plugs - properly gapped, valve clearances and ignition timing. Also check all the vacuum pipes for pinholes or cracks and if you have an EGR valve then its probably worth cleaning out all the passageways and pipes. If you have access to a compression gauge then give it a compression test to ensure that the engine is in good order.
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Old 09-11-2010, 11:35 AM   #3 (permalink)
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I'm not sure who told you that would clean your injectors but it won't. You need to get a fuel injector cleaning kit and clean them properly. If they are sticking or blocked from carbon build up then you can't just blow them clear with air or vacuum pressure. You need to use an injector cleaner. The additive that you put in a tank will not do the job properly. That is good for preventative maintenance and mild build up, but for a thorough cleaning you need to use an injector cleaning kit.

It may not be the injectors, you may have a short somewhere that is grounding the signal to the injectors, or malfunctioning intake temperature sensor, or MAP sensor, or coolant temp sensor.

I'd go with Rhinomans suggestions and give the vehicle a complete tuneup before trying to tackle the intake management system. If any of that other stuff is out of order then it will really hinder your ability to track down any electrical or sensor problems.
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Old 09-12-2010, 07:26 AM   #4 (permalink)
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Quote:
Originally Posted by Baratacus View Post
I'm not sure who told you that would clean your injectors but it won't. You need to get a fuel injector cleaning kit and clean them properly. If they are sticking or blocked from carbon build up then you can't just blow them clear with air or vacuum pressure. You need to use an injector cleaner. The additive that you put in a tank will not do the job properly. That is good for preventative maintenance and mild build up, but for a thorough cleaning you need to use an injector cleaning kit.

It may not be the injectors, you may have a short somewhere that is grounding the signal to the injectors, or malfunctioning intake temperature sensor, or MAP sensor, or coolant temp sensor.

I'd go with Rhinomans suggestions and give the vehicle a complete tuneup before trying to tackle the intake management system. If any of that other stuff is out of order then it will really hinder your ability to track down any electrical or sensor problems.
V.W. Dave from Outer Limits Suggested it? Ok well I will gradually just work through my field service manual than..
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