2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Crappy Idle

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Old 01-07-08, 03:19 PM
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Crappy Idle

Background Information:

A couple years ago, I was driving my car back from a 4th of July visit to my hometown. It was a very hot, humid Nebraska day with about 4.5 hours of driving to do. When I got to Omaha, I went to a close by Sonic to grab something to drink. I shut the car off, only to hear an annoying hissing sound coming from my engine bay. I took a quick look at the outside of the car and could see steam and a green puddle forming under neath my car. The fuse that ran my electric fan died somewhere on the trip (Best reason I can think of NOT to get an electric fan) I let the car cool off for a little while before driving it home the last few blocks. I tried to take the car work the next day, but only got about a mile away before my car was bucking and stalling horribly. Ive spent many hours trying to find the problem, and being stupid. Ive narrowed it down to a couple problems.

- Air Intake Leak
- Low Compression
- Disconnected hose that should be connected
- Dying Fuel Pump (Didn't have the exact tools to check pressure, but holding pressure is NIL when the car is off.
- Clog somewhere in the fuel system (New filter and fresh gas used)
- I'm retarded and shouldn't be fixing this car alone.

I'm not limiting this to ONE problem, but possibly all of them.

When I bought the car, it had already been highly modified. i.e. Removal of several systems including AC and PS. I had hoses and wires all over the place that I don't know the function of. I have a Haynes manual, but that has only gotten me so far.

Somewhere in between the last time I drove the car, and today, a whole mess of hoses got disconnected from the engine. I was able to identify and replace some of the hoses. I have two hoses now that I am currently suspicious of being one of my problems. Unfortunately, I only have 1 place to put a hose, and I don't even know that a hose goes there. I have checked the manual and I couldn't find an image that helped me out.

Current Symptoms:

- Rough and Erratic Idle
- Afterburn, especially in higher RPMs
- Occasionally has rough neutral engine acceleration
- Stalls Easily
- If the car is warm, the problem is not as bad. I was able to drive the car for about a block before anything bad starts happening.
- While driving and accelerating, the car will sometimes sputter out and return to idle, even when the pedal is down.

I will answer any questions that may get this car back on the road before summer. I have alot to work on to make this car it's former self, and I would like to have it running before working on the looks. Paint and new popper kit for my doors are a must. Some bondo work is also required for the doors.

Explanation of Files:

http://www.automotivegraveyard.com/R...em_archive.zip

Hose 1 and 2 are pictures of the hoses that are currently disconnected.
Leak is a picture of my Thermostat Housing Cover (Which I will be in the market to buy after the engine problem is fixed - Anyone have one of these for cheap?)
RX7 - Startup and rev
RX7 2 - Startup and Rev (Cold start activated) Some Afterburn toward the end
RX7 3 - Startup and Rev heard from engine bay

I took the sound files with my phone, so quality is bad. I can pretty much describe exactly what you hear if you notice a weird sound.

Thanks for any help! Pictures will be taken upon request. If you would like to hear anything more closely, I can be reached via phone. PM for number.
Old 01-07-08, 03:28 PM
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Well it's not the fuel pump, because if that went bad the car wouldnt move. no fuel, no stability..
Old 01-07-08, 09:30 PM
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Originally Posted by Shenti
Well it's not the fuel pump, because if that went bad the car wouldnt move. no fuel, no stability..
Can they "Start to go bad"? Not completely fail all at once, but loose their pressure, and work in some instances?

On another note, I did a compression test by listening with a spark plug out. (Thanks aaroncake for the amazing website which also helped me decide to buy my first rotary) It seemed just fine to me. I had quick even pops on both rotors.

Has anyone had any luck or thoughts to identifying the hoses?
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