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Old 04-20-2009, 09:04 PM
rkazantsev rkazantsev is offline
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Default Unable to GUN it

Hi all Ive always had this problem and wanted to know if any would know what would cause this. When i gun it I hear a sound like a back fire and black smoke then engine cuts off until I lay off the gas pedal. If had the GN for many years and I was told it has a bigger turbo and injectors (blue). I previous GN was stock and I was gunning it with no problem.

Regards,

Ruben
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Old 04-20-2009, 09:29 PM
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Exclamation Re: Unable to GUN it

Chances are you are running the boost beyond what the fuel available can support, making the engine go lean, and trying real hard to blow a head gasket.

Do not do this repeatedly. Or at all.

It is possible that a vacuum line may have have come loose, fuel pump is not large enough, or there are other problems.

Do you have any sort of scan tool to see what your ECM data is? That would help a lot.
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Old 04-21-2009, 01:32 AM
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Default Re: Unable to GUN it

where are you located ?
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Old 04-21-2009, 11:56 AM
rkazantsev rkazantsev is offline
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Default Re: Unable to GUN it

Ok I was under the hood and notice a cut hose that goes to a big plastic ball SORRY not sure on what it is. On the left side. Where can I purchase a scan tool on line or what should I get? Also is there a way for me to lower the boost pressure?

Thanks

Ruben

I live in Van Nuys CA north of Los Angeles
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Old 04-21-2009, 12:38 PM
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Lightbulb Re: Unable to GUN it

One step at a time...

- Can you replace the hose? The "ball" is actually part of the emission system, but any vacuum/pressure leak could be part of the problem.

- Do you have an external boost gauge, or only the one in the dashboard?

- Do you have a digital or analog dashboard? (i.e. digital LED "numbers" that change or a speedometer "needle"?)

- Probably the best scan tool for you will be the Scanmaster. See http://www.fullthrottlespeed.com/ite...GN~eq~~Tp~.htm

- You may be able to adjust the boost. The wastegate actuator (mounted to the turbocharger) was not adjustable from the factory. But you indicated you had an upgraded turbocharger. So there is a chance you have an adjustable wastegate. It looks something like the attached picture (only much larger) and may have a threaded rod going to the wastegate. If it is visibly threaded, it is adjustable, if it appears to be solid, it is likely not adjustable.

The real question is how much boost the car is currently putting out, is there enough fuel for it, and if the boost is too high, why?!?!
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Old 04-21-2009, 01:01 PM
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Default Re: Unable to GUN it

1st let me just say thank you for your help.

- I will head out to dealer to replace "ball" or order online

- I have both internal and "external" aftermarket boost gauge

- The dash is analog

- The wastegate actuator does not have a adjust or threaded, what I mean is the arm is a solid piece no way to make it shorter.

I am going to look for all the paper work I received when I purchased this car. He had all the info on the type of turbo, injectors run times. I know he told me to keep the boost under 12 with reg 91 octane and 17 on 100 octane. His best run time on 1/4 mile was 11.05.
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Old 04-21-2009, 04:29 PM
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Default Re: Unable to GUN it

can you try posting some detailed engine photos, so we can see what all you have?
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Old 04-21-2009, 05:36 PM
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Lightbulb Re: Unable to GUN it

Quote:
Originally Posted by rkazantsev View Post
I will head out to dealer to replace "ball" or order online
Chances are only the hose needs replacing, which should be simple and not require a dealer.
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Old 04-21-2009, 09:41 PM
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Default Re: Unable to GUN it

The plastic part of the "ball" where the hose goes to is broken tried to crazy glue but no luck so it looks like need to replace. Ill work on getting some more details and photo's tmrw.

Ruben
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Old 04-21-2009, 10:02 PM
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Lightbulb Re: Unable to GUN it

I suggest getting a used one. Dealer will likely not have such a part for a 22+ year old car, anyway. Post a wanted ad here and I'm sure one will be found. Someone in an area without emissions may give it to you.
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