Single Turbo RX-7's Questions about all aspects of single turbo setups.

Frustration. Not a good day for my 7.

Old Jan 23, 2004 | 01:21 AM
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Thumbs down Frustration. Not a good day for my 7.

Well, I finally got my fuel filter for my FD a couple days ago. So, installed it, and tried to do a fuel pressure test. I get in the car to turn the key on, and notice not even the dash lights up. Dang.....batterys dead. So I pull my wifes Tacoma into the garage, and start charging the battery. I let it charge for 10 minutes or so. Pull the Tacoma out, and go to hit the key again. Still dead. Well, atleast I've started to get the beeping that goes on when you insert the key into the lock. Pull the Tacoma back in....charge it for awhile longer. Finally get enough of a charge in battery to pressure test the fuel system. Fuel system checks out. No leaks, funny noises, or flames. I manage to get the 7 started via jump starting it with the Tacoma again. It fied right up and the car actaully idled fine! To be honest, I was very suprised! I let it idle for around 5 minutes, making shure the fluids where topped off, no fuel leaks, fires etc. So, I decide to take my car for a quick spin. Now keep in mind that this is the realy first voyage of my newly installed single turbo setup/fuel system. So, I'm trying to keep it close to home....just incase something does go wrong. I putt around some neighbor hoods, mostly in 1st and 2nd gear. I travel around 3-4 miles without any boost or anything. Just puttering around realy. The car is running great. Then on my way back, I decide to test out the BOV. I start to push down on the gas pedal just enough to get just above the "0" on my boost gauge...all of a sudden the car pops, I let off the throttle and the BOV does sound...but now suddenly, the car is running realy rough, and billowing some serious smoke! I'm like O CRAP! Head for my house as quickly as I can on one rotor. Manage to back it into my garage, and shut it off. Just for kicks I try to restart it...all it does is spin. Does'nt even try to sputter to life. The car is pumping out nothing but raw fuel. Huge billowing clouds of it!

So I go in and give Ralph Friend a call about a upcoming dyno day for RPNW. We start talking about my car, and I tell him what happend. He says that his guess would be a injector O ring let go. This would make sense. When I installed my 850cc into my primarys, I double O ringed them, and did'nt mill off a 1/8". He says to fix that problem and it should be fine.

So today I take my battery to work and charge it all day long. I then mill off 1/8" off the top of my primary fuel rail. So, now I'm realy looking forward to taking this car out tonight. Get home, slap all the stuff back onto the car, along with some new leading plugs. Hit the key, and the car starts right up....on one rotor. I decide to pull off my secondary injectors connectors (Thinking maybe one of my 1300cc allready died on me.), pull the fuel pump relay, pull bolth leading plugs. (They are realy wet too.) I turn it over for a little while. Sounds like all chambers are hitting allright. I'm starting to get a little upset and decide to have my wife turn the engine over, while I hold my finger over each of the spark plug holes. Bolth front and rear rotors have good compression....well atleast there are'nt and dead spots I figure.

So now, I plug everything back in minus secondary injectors. Go to hit the key....and it wants to start...but not quite. And still only on one rotor. So, at this point its getting late....I just unflooded it one more time, and am going to leave all the plugs out over night. Replace them fresh ones again tomorow, and hopefully something better comes of this.

Whats just crazy is that the car was running perfect until I hit a positive manifold pressure. Then it just started running like crap ever since. (Yeah, the map sensor is plugged in!) The engine has good compression on front and rear rotors...kinda just weird.

Tomorow, I'm going to check out the HI-6, to make shure I"m getting spark. I'm pretty shure I am, but I'll make shure tomorow

If anyone has any suggestions feel free to let me know.

Thanks, CJ

Last edited by pp13bnos; Jan 23, 2004 at 01:25 AM.
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Old Jan 23, 2004 | 01:31 AM
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have you checked the map sensor? If it poped off, you will run rich as hell and spit out raw fuel. I did that once changing the spark plugs and could not find out what the prob was. It had a hard time starting and would blow out black/brown smoke. It also sounded like it was running on one rotor

Last edited by LT1-7; Jan 23, 2004 at 01:34 AM.
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Old Jan 23, 2004 | 08:16 AM
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Yeah, its plugged in. That was one of the very first things I checked.

I think that the very first thing I'll do is pull out the fuel rails, and pressurize the fuel system again. Perhaps the 0 rings on anouther injector are'nt to good, and is leaking.

CJ
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Old Jan 23, 2004 | 10:35 AM
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Did you check whatever vacuum lines, block off plates, and UIM nipple covers you have? Maybe the pressure blew something off and you've got a leak somewhere?
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Old Jan 23, 2004 | 12:33 PM
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Your spark plugs are fouled out. You have to retune when you change the size of your injectors.
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Old Jan 23, 2004 | 10:51 PM
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Your spark plugs are fouled out. You have to retune when you change the size of your injectors.
I'm sorry, I forgot to mention, Ralph Friend gave me some injector setting for my car. I mean, it ran smooth, crisp throttle response with no feeling of the plugs loading up. Then less than a 2 psi, max....it started doing this.

Tomorow I'm going to tear into this until my wife gets off work, (Going to parents house for a family birthday party thing.) and I got Monday off too. I'm going to tear this car apart.

If I find anything, I'll be shure to let you guys know. CJ
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Old Jan 23, 2004 | 11:47 PM
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Cj, Try cranking the motor without plugs and get all fuel out. Then
dump in some atf and try to start with new plugs. Call me and let me know what happened. Usually gas will wash the rtotors and housings down a lot and the compression goes below 75psi and starting is a bitch.
Ralph CJ call me on my cell.
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Old Jan 23, 2004 | 11:57 PM
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Old Jan 24, 2004 | 11:10 AM
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Ahhh...not shure why I got the flame smiley.....but anyways...

Pulled all the fuel rails off the motor, but left the injectors,and lines all hooked up. Turned the key to the ON position, and that was all I needed to figure out my problem. Suprisingly, the primarys sealed fine. Turns out my front 1300cc injectors seals are junk, or its allready burnt out with less than probably 5 miles on them.

I'll let you guys know how it turns out. CJ
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Old Jan 24, 2004 | 11:13 AM
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Ralph, I may be giving you a call about a fuel pressure regulator, and some 1680s. CJ
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Old Jan 24, 2004 | 11:43 AM
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Well, the injector is stuck on the open position. So, soon as I hit the key the fuel pump pressurizes the fuel system, and flooding the engine before it has a chance to even turn over.

I remember hearing somewhere about how the cleaining solution that RC uses will make the injecotors stick, if the injecotrs are'nt used right away. Does anyone remember this? CJ
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Old Jan 24, 2004 | 11:56 AM
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turbovr6 had a similar problem but he got bad 1680's. i gave him mine and car ran great
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Old Jan 24, 2004 | 11:58 AM
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Originally posted by pp13bnos
Well, the injector is stuck on the open position. So, soon as I hit the key the fuel pump pressurizes the fuel system, and flooding the engine before it has a chance to even turn over.

I remember hearing somewhere about how the cleaining solution that RC uses will make the injecotors stick, if the injecotrs are'nt used right away. Does anyone remember this? CJ
Cool, you found out what was wrong. At least it didn't turn into a 2 month search. You still can't beat james' problem. His injectors got stuck in the full blast position. It filled up his whole engine, intake manifold, intercooler, and started to spill out the turbo compressor.
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Old Jan 24, 2004 | 12:01 PM
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You still can't beat james' problem. His injectors got stuck in the full blast position. It filled up his whole engine, intake manifold, intercooler, and started to spill out the turbo compressor.
Yeah, now that was crazy! I'm just hoping I can get everything figured out before March 14th. CJ
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Old Jan 24, 2004 | 03:32 PM
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Ok! After figuring out the problem, I gave Ralph a call. He gave me some directions to get it unstuck. Put a little voltage to it, some starting fluid, and a big hammer. After a little cleaning, it started working correctly. I installed everything again, and when out for a joy ride. Everything seems great! Even got into a little boost. .06 according to the power fc without any problems. I would have driven it harder, but the car is tuned for twins at this point.

I'd realy like to thank Ralph for taking the time to realy help me out. Without him, I probably would have sent the injector back to RC...where they would have told me, that I need a new injecter, and needed to be bored out again...etc. etc.. Thanks once again Ralph! CJ
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Old Jan 24, 2004 | 04:33 PM
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starting fluid and a hammer? Can you elaborate a little more?
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Old Jan 25, 2004 | 10:43 AM
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Well...there was a cutin' torch too....but I figured I'd leave that part out.

I just put the injector upside down, put some voltage to it a couple times, then squirt down where the little needle portion of the injector sticks out. After a couple minutes of doing this, I'd take it out of the vice, and gently tap the injector against (so it the top portion of the injector was being tapped.) against a clean surface. The repeat all over again. After awhile, a little black peice of crud came out. I don't know If it came out of the injector or what....but I could no longer blow backwords through the injector. Then I reinstalled it, and whent out for a spin. So far so good. The injector did'nt burn out, it was just stuck in the open postion.

Btw, I was just jokin' about the cutting torch/hammer. CJ
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