Hey everyone, whats up. I have been having so many problems with my car! Ok let me explain quickly. First it started off when I would shift from 1st to 2nd at high rpm I would not get boost in 2nd. Then I started getting like a 8-5-8 boost pattern, sometimes boost would just drop off at the transition. Also this problem was accompanied by a distinct hissing sound. My first assumption was that a vacuum hose popped off, so I went ahead and removed the upper intake manifold and began checking for bad or popped off vacuum lines. I found a pinched line, and a couple loose ones, and put everything back together. After I put it all back together (Sat for a weekend) the car started up with a really rough idle and began smoking. I let her warm up and the idle remained really rough but I tried to take her for a drive, and as soon as I got on it, it started bucking, and at the 3K rpm point, I would get no boost at all, just more bucking, and upon letting off the gas I would hear a whistling sound. Can anyone help me?? please? I am lost, and I have done alot of searching to no avail. Contemplating suicide...j/k, but seriously I am going nutso!! Thanks for any help you can give me guys.


-Bobby

 

Anyone???? Please?

 

Try to reset your ecu ! That might work.

 

Thanks To SLow, I will definitely give it a try and let you all know if it worked. Thanks again..

 

Ok, well I tried to reset my ECU, and nothing. The car pours out alot of gas-smelling smoke, and reads a 10psi vacuum, and idles horribly under 1,000 rpm. Anyone have any idea what could be wrong with her?? Thanks.


-Bobby

 

Check your map sensor, it's a small black box on the drivers side firewall. It has a small valve on it, and a vacuum line that goes to the extension manifold. common problem. Also if you hear leaking boost, I'd check your y-pipe connection. This part gets small cracks in it, and leads to boost leakage. This is a big problem, because even though your engine is not getting enough boost, the turbos are spinning even harder trying to create the proper boost patern. This can kill your turbos. good luck,

eric

 

Thanks for the reply Eric. I checked the MAP sensor hose, and its on just fine. I thought it was that at first, but I guess its not. What else could it be?? I am totally lost!! Thanks for the help you guys, any more advice would be greatly appreciated!

 

The first hoses you should have checked should have been the accordian hoses that go to the IC and from it. You'll have to take them off and sqeeze them a good bit to show any cracks since the cracks are visible unless pressure is flowing through them, letting boost out. On a dyno, you see old hoses inflating like ballons under the stress of boost. Also, the hose, like hapa stated above, that connects the ypipe to the crossover piping to the IC tends to leak with splits or clamps that aren't on tight enough. check all the clamps as well and replace those stock constant pressure clamps with some clamps you can tighten down.

Tim Benton

 

Thanks Tim, I did check all those hoses, and I found one with a large crack in it coming off the Y-pipe, and its been replaced. My problem now is the car is idling at around 800rpm, reallly rough, blowing alot of fuel smelling smoke. Any advice?

 

Check your spark plugs, you may have a problem with your ignition system.

 

I checked them a couple days ago, they were the NGK plugs, not platinum, and they were real black. But I dont understand why it would have this kind of problem all of the sudden. It only started after I put everything back together. Now my car wont turn over either. I'm about to take it into expensive a** Pettit, but I really dont want to do that because this seems like something fairly minor. Help?

 

No one??

 

Maybe you should take off your extension manifold again and make sure you didn't forget to plug something back in. To me, it sounds like your map sensor, but you said you already checked that. You checked to make sure that the hose is connected to the manifold side too, right?

 

Yep I checked it alright, everything seems fine there. That is why I am so confused as to what the problem could be

 

No one??

 

It sounds like either you forgot to plug something back in, or maybe one of the plugs/wires got damaged when you had it apart. Did you check for any stored fault codes in the computer?

 

Hmm, that could be. How do I check that? With the diagnosis box method thingy? Also, someone told me it might be my Fuel Pressure regulator, or the fuel compressor or computer or something. Any truth to that?

 

To Check Engine Light Codes, go to:

www.scuderiaciriani.com/rx7/engine_codes.html

There you can find a complete list of engine codes for the FD and how to read them.

Hope this helps. Even if you can't fix it, it should at least tell you what is going on with the ECU.

 

Ok, I changed the spark plugs today, it made no difference whatsoever. The car started up alright, but then as usual fuel-smelling smoke started coming out, and vacuum pressure was jumpy at 10psi, and it idled horribly between 800-1000rpm. No check engine light came on. What could be the problem, no one seems to know what this could be, its driving me nuts!

 

Come on, someone has to know!! Please! I'm dying!

 

Anyone???????

 

LOL AHAHAHAHAHAHAHAHAHAAAAAA!! I am such a moron!!! I had the damn hose from the MAP sensor on the wrong NIPPLE!! My car idles perfectly fine now at around 1100 rpm, and 15-18psi vacuum, steadily. Stopped smoking. Ok, now I have more problems. LOL. Ok sorry. Anyways, now the car is real rough under like 3 grand, and I am not getting full boost, sometimes no boost, and when the boost does come on I hear this kind of rattling noise. Also, I took out the EGR solenoid, because it broke, would it be because of that? Could it be a misplaced vacuum hose in the Rats Nest? Also, in 5th gear it wont go past 3500rpm. Any help? Thanks guys!

 

I'm pretty sure that your boost map sensor(or the hose) is bad.
There is no such a thing as a wrong niple at the maifold
DAN

 

I had it plugged onto a nipple on the side of the throttle body, it was the wrong nipple I am sure of it, I looked at a picture of where the MAP sensor hose goes, and put it there, and it began idling just fine. But now I have the above listed problems.

 

You might want to consider the poor-man's non-sequential to see if that might fix your problem. Unfortunately with the stock sequential system, there are so many vacuum lines and solenoids that can pop off or crack. Might be an alternative if you can't locate the problem.