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Need Your Wisdom Asap. What Is This?

studricho

By studricho,
in Engines & Forced Induction

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studricho Enthusiast

studricho

Posted
Posted

dscf3978hq1.jpg

dscf3980kc7.jpg

I have finished my car and this was left out. My sparky said I didn't need as it was for the boost gauge for the dash. To me it looks like a map sensor and it could be the cause of the issues with my car.

Please go easy on me as I'm a complete noob when it comes to RB25 engines.

The symptoms are-

-Weird idle once the car is warm

-Breaks up on light throttle over 4,000 rpm

-Forget about any hard throttle..not happy.

From my understanding this device coverts manifold pressure into an electrical impulse for the computer to make it's adjustments..correct me if I'm wrong.

By the way. I'm running everything standard R33 stuff.

Your help would be fantastic. I have diagrams, but I can't find it. Anyone have a pinout number for the computer on this by any chance?

-

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The Dan Grand Master

The Dan

Posted
Posted

It is a map sensor.

It only operates the standard gauge so not required.

light throttle and 4000rpm breakdown sounds like a fuel issue. Check fuel flow before and after the filter. Do a pressure test and see what it does while driving and breaking down.

You could also have a second issue with the 02 sensor or the coolant temp sensor. Check these with a multimeter.

Also do as suggested above and check for vac leaks.

studricho Enthusiast

studricho

Posted
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Posted

Thanks for all the replies so far. We did find one issue tonight..Over boosting. I found that the standard boost solenoid has an issue. I bypass this and now the boost/waste gate is working as it should.

It's still surges a bit, but much better to drive now. I had a quick look at the timing tonight cause I've changed the timing belt before the engine went in. I don't think it's right so I'll see someone about it.

I need to check the fuel filter as this car has been off the road for nearlly 9 years. Even though the filter was new when I put this engine in it may be full of junk.

Is there someone in the gong that you could recommend?

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