Well a couple days ago, my friend just got headers put into his RSX. So he wanted to see how he would do against me. So we go onto the highway and from a 2nd gear roll we gun it. I immediately get 2 cars on him, then all of a sudden the car starts to backfire and smoke from the exhaust. I tought i blew the motor, because there was absoulutely no power, the car was just sitting there. He immediately blew past, so then i go into 3 and try to go and it pulls all of a sudden. But whenever the car goes about 5500rpm's the car just starts to backfire, smoke, and lose all power. So i browsed the forum to check to see whats wrong.

While browsing the forums i saw some FD had the same problem and solved it by changing his sparkplugs. So i changed mine a couple days ago with NGK's (stock ones). The car is pulling harder, but now the car is only doing it in 2nd gear, and above 6000rpms in all other gears. Please help me.

ALI - 94' Touring Black

 

Fuel cut? What psi are you at? If you are at prolonged high boost levels about ~10.8 at certain RPM's you'll hit fuel cut and it feels like a slight hesitation.

 

nope its not the fuel cut, im positive. I keep my eye on the boost gauge, as soon as i see anything above .7 bar, i lay off the gas a little. This happens when the car is around 10-11 psi.

 

If you go past 5500 RPMs at a medium throttle with no boost, say first gear, does it also occur?

 

no it doesnt happen

 

Boost cut can happen at 11 PSI on the stock ECU depending on the RPM:

 

But i know what the fuel cut feels like, and i highly doubt that i am hitting the fuel cut. Plus does the fuel cut make your car belch smoke and flames?

 

you are running a mp with no ecu?

how long have u had the car running like this? Are you trying to blow the motor?

 

I had the exact same thing happen to me. Changed the plugs, all was a lot better.

 

im not trying to blow the motor. Also, i changed out the sparkplugs and they were pretty bad. I put in new NGK's stock heat range.

I did have a problem with my throttle body, and had it checked out at mazda. They fixed it and they put silicon all around the elbow, where the elbow meets the intake manifold. Just wondering if that could be the problem?


please help me , im loosing the RSX's

 

My car does the same but its because I got tuned rather conservatively when it was still cold out and now that its how Im running way too rich, when its really hot/humid outside its allot worse, but yours is not the case...

 

Are you sure?
That is a very dangerous setup you are running. But i am sure you already know that.

Get an ECU.

 

Definitely get an ECU asap with those mods

 

i had something similar and it was my leading coil going bad.

 

Have you looked at your Double Throttle Control?

When I removed mine, I wired the Double Throttle closed accidently. It ran fine and boosted to 10psi until higher rpms when it started shaking really bad. Once I figured out what I had done, and correctly wired open the Double Throttle, it accelerated during high rpms fine.

It was at night, so I don't know if I had any smoke or not.

 

I agree with zooq, it is either a coil problem.
Or you need to upgrade/check/add the main ground.
I swapped out the dinky stock one that attaches on the firewall on the pass side to the UIM with a beefier 4 guage ground strap. Also if it is loose you will get similar hesitation. You can also add a few ground points and see if that clears things up some.
If none of that works I say start looking at the coils to be the problem.

Dave

 

thanks, i just hope its one of the grounds. If its one of the coils, i guess ill have to wait on that new stereo

 

don't by an expensive FD coil, just go to a junk yard and get a 2nd gen coil, i got one and it worked great. you can also change its location so that it would get cool air. right now its under the UIM and thats not the best spot.

 

Check the grounds, plugs & wires...if that doesn't work get an igintion amp. You probably don't need it since you don't have tons of mods yet. But, it helped clear up my hesitation after I installed a supra Fuel pump.