C.A.R

Ok.. Heres the story... My car stinks like gas... I am getting crappy fuel economy (less than 10 mpg)... I could barely keep up with a slightly modified honda civic 3 door...
I have checked my injectors... Primary are clicking like they are supposed to... The secondary do not... I have unplugged the pressure sensor on the shock tower and checked with a stethoscope at 3500+ rpm... Nothing... I did notice an explosion in the front rotor that was not in the rear rotor... I checked the crank angle sensor... Nothing seemed out of order... I could not seem to locate the solenoid resistor to check it... The resistance of the secondary injectors are fine... Any advice?
By the way... This is a totally stock 1989 plain RX7... No turbo...
Any help would be greatly appreciated...

iceblue

Put a test light on the S injectors. Pull the PS to 20inhg with a vaccume tool and rev the car to 4.5k. You will see the test light come on this means they are working :-D.

Sideways7

iTrader: (7)

I'm pretty sure you can tell if they arent working just by how they drive. Is it just kinda slow all over, or does it totally fall flat on its face after 3800? Unless it just totally runs like **** after 3800, they are at the very least coming on.
That said, do a compression check just to see what kind of shape your engine is in. Check the plugs, and change if needed. The injectors are probably clogged as well and could use a cleaning, unless you know they were cleaned recently.

cdaleracer669

iTrader: (1)

is there gas sitting on the engine by the fuel rail under the manifold?gas coming out the other fuel rail? compression check?

Healing

N/A FCs aren't exactly powerhouses...

cdaleracer669

iTrader: (1)

but if its modified it should whoop up on hondas........from my experience at least.that, and the crappy gas mileage indicates a problem.

C.A.R

ICEBLUE
"Pull the PS to 20inhg with a vaccume tool and rev the car to 4.5k."
This answers another question... I posted another thread for this same question... I just had more info at the time... I am assuming you mean Pressure Sensor when you said PS... I Pulled the vaccum hose off of the pressure sensor and went to 3500 rpm... This is what the guide said to do... They did not work... I connected a volt meter to the injecter plugs and got nothing... I wired the injectors directly to the battery and they work... I will try the test that you gave me on the pressure sensor located at the passenger shock tower...
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SIDEWAYS
I have recently changed the plugs and checked the compression with the "PSSST" test... I set the timing and put new wires on also... I put a timing light on all four plug wires to make sure that they all fire... I am going to put a fuel system cleaner in on my next fill up, and at 10 mpg or less, that wont be long... : )
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cdaleracer669
I ont see any fuel leaks at the secondary... I cant see the primaries good enough to say yes or no... Compression sounds good, although I have never guaged it...
***
Does anyone know what pins should be checked, what resistance should read on those pins and what I should vaccum the pressure sensor to...?

Aaron Cake

iTrader: (1)

If the car reeks like gas and you get 10 MPG, there is a problem. Do a FULL 60K tuneup as specified in the FSM. Check the condition of all the sensors as per the instructions in the FSM. Plugs, wires, etc.

jeremy

iTrader: (1)

my car was somewhat similar. turned out the precats fell apart into the main cat and had it clogged pretty badly.

RockLobster

iTrader: (7)

Running that rich DID (not probably) destroy your cats.

C.A.R

Wouldn't the cats being clogged completely keep the car from running at all? I had an 86 years ago that had a bad clogged cat... I tried to gut the big one... I ran into a metal guard half way through it... I rinsed it out really good to make sure it was getting flow through... I let it dry and put it back on... It blew my apex seals...

Keep in mind... This car was clogged bad though... It would not run at all... I would have to floor it while trying to start it... When it did start I could not let it run at less than 3500 rpm or it would die... And after a few minutes of running like that the cat would be a bright orange glow and it smoked terribly... It smelled like a mix of burned hair and burned sugar...

But again... My secondary injectors dont ever kick on and they do work when voltage is applied directly to them... I would think this would be a good reason for lack of power, but I am not sure that this would contribute to poor gas mileage and the smell of gas...

Dcrasta

leaking fuel rail ?
Raw gas = fire shut the car down until you fix it

NoviceRotaryTech.

yeah I would not drive that car.
I would check all the fuel lines and hoses, even at the fuel pump. I would even check the fuel tank drain plug.
As far as secondary's go, you could always upgrade em.
Strait-pipe the cat while your at it.

jeremy

iTrader: (1)

are you calling me a liar?

and it was a pt cruiser that beat me.

classicauto

iTrader: (3)

Pointless.

Keep stock size injectors (440cc) in the car because its N/A. Unless you've got some wild porting and an EMS, (or at LEAST some type of fuel control) upgrading the injectors will simply cause the car to run rich(er) and lose power.

I suggest:

Inspect pulsation dampner, fuel rail, regulator, filter and lines. Replace as necessary.

Have all 4 injectors cleaned/serviced/flowed

Then, as suggested, a full 60k tuneup and check your grounds out.

NoviceRotaryTech.

I was joking about the secondarys, hence the smiley ()