Pleas help me if you can:

I have a '94 fd automatic. I was driving down the highway doing about 65mph. I punched the gas to pass a car and something happened. I have no boost and no acceleration. I got off the highway and it died when i ccame to a complete stop. My gas guage was at about and 1/8 tank. Could I be out of gas? Could this maybe be a fuel filter? I do not believe its a spark issue cause the car will turn over start, idle rough (like its not getting gas) and then die.

any help would greatly be apreciated!

--cody

 

Never let it run low on gas, because you should know that a FD that runs lean = detonation. You know where that ends up. Do a compression test, because you might have run lean. I would also suggest getting gas at your nearest station.

 

what are the symptoms of detonation? i put more gas in it and it started but will not idle

 

Check Map Sensor, might have popped off...or the motor might have popped???

 

map sensor was connected.......what do u mean bye popped? If this happened would i hear anything? The car runs fine with no weird knocking or pinging. It just will not idle. Im going to change the fuel filter and the plugs and see what happens. Ive read some posts about detonation and i have had none of the symptoms other than the low fuel.

Thanks
Cody

 

Check all the connection points on the map sensor. From what you have described it sounds like thats your problem.
Good luck
PS if map sensor hoses and connection are good check the other vac hoses especially those related to fuel/idle unbolt the pressure tank and look around under the intake manifold for loose hoses.

 

I just came back to see if anyone commented and realized you said it runs fine other than idle. So like someone else said it could be the worst case scenario meaning check your compression but what ever it is let us know what you find.

 

Ok,
I started investigating the problem. i pulled off all of the intercooler piping, intake elbow and air intake. I found alot alot of unburned fuel in the i/c pipes and my spark plugs where black and covered in gas. Aslo removed the uim and did not find any bad/craked vaccum hoses. Is the black plugs causing the unburned fuel to recirculate throught the intercooler? Can fouled plugs be the cause of what i posted above? Also, if someone know, is there a website i can go to to give me all of the standard amp draws on all the electrical connectors?

Thanks (In Advance)

Cody

 

I forgot this as well,

Other than bad gas or bad fuel filter......what else can foul the plugs?

Thanks again,
Cody

 

I don't think there can be fuel in the intercooler (right?). Maybe it's oil from the turbos. That is quite common I think.

 

Thanks for responding.

If im not having spark then it is possible for raw fuel to be re-circulated......I know about the oil in the i/c piping. There was also raw fuel in the intake elbow.

--Cody

 

you sure it was fuel and not oil?

 

If it was me I would change the fuel filter and then replace the spark plugs. If that doesn't work then you probably need to adjust your fuel coming into the engine.

I would say you are running too lean from what I'm hearing. I honestly don't know how to adjust that on an Rx-7 (I haven't had to deal with this problem yet) and so maybe it does have something to do with the Map Sensor.

By the way you aren't the only Cody on this Forum. I have a 94 PEP also, but mine is a manual.

- Cody

 

Cool.......But if i was running lean, wouldnt the plugs be white in color? I think there is something fouling my plugs causing it to run rich and re-circulating the raw fuel.

 

Can you (or someone) explain to me how you can get fuel in the IC piping. That would mean that exhaust gasses are getting into the intake right? I'm not trying to be a dick or anything, I just don't see how it can happen and I guess I need educating .

 

Dont the turbos recirculate some of the exhaust?

 

I don't think the turbos mix the exhaust with the intake air (at least, they are not *supposed* to). The exhaust and intake flows are kept on seperate sides: the intake on the compressor side and the exhaust on the turbine side.

 

But there can be raw fuel going through to the exhaust side that is not burned due to a fouled plug or no spark.

 

anyone?

 

Did you say you could start the car back up now or not? If not then the engine may be flooded. If the car does start back up then you may have a major vacuum leak.

- Cody

 

i have not tried to start the engine again.....i need to put it back together. Once i do i wiil let you know.

 

It is possible that there is unburned fuel in the exhaust, but highly unlikely that there is fuel in the intake/ic. You might want to make sure that what you're seeing in the ic pipes really is oil and not fuel. If it *is* fuel then you have a serious problem somewhere and you need to find out how it is getting there. But more than likely its just oil.

By the way, just to let you know, I kind of a newbie too so I can't give you much advice about how to fix anything. I only responded because fuel in the ic pipes sounded wrong .

 

This is what happened to me as well. I was at Mid Ohio running great (137 down the back straight). I pulled off the track when my session was over and she wouldn't idle. I had to keep it at 1800 rpm's or more. I took it back out on the track and she ran fine, just wouldn't idle.

Compression check the next day showed the front rotor in the mid 2's, rear in the mid 7's. The engine only had 2050 miles on it . . Dropping in engine # 3 this week

 

What are good numbers of compression? I am having a compression test done this coming weekend.

 

http://www.scuderiaciriani.com/rx7/c...sion_test.html