Aaron053191

Hello everyone, Here for help is Aaron. I have a 91' Prelude 2.0 Si 4WS.

Last night I was playing around and dumped the clutch at 5500K and then went to hit 2nd gear, and everything went to hell.

Instantly I was and still am suffering from a very rough idle, and it will not rev past 3K in or out of gear. Its seems like its being governed.

I have checked for spark, its great. Each plug wire I pull off does make a differerence in idle. I have no signs of a CEL. I pulled the fuel rail, and there was plenty of fuel at each injector.

It has to be electronic? Help? Advice?

kmcormick9

Jumped timing? Hole in a piston? Burned valve? Sounds like you may have blown something. Do you have access to a proper fuel pressure tester?

Aaron053191

I will If I take it to my buddies garage. I was trying to see if I could come to an conclusion without having to dig real deep.

When I drive it, at certain points it will rev to 6K, then basically dive on its nose.

Im really hoping I don't have to pull a head or something crazy like that.

kmcormick9

Theres a possibility your coil may be going bad. "A visible spark" and "Good spark" arent necessarily the same.
Check all your grounds

Aaron053191

When I bought the car, there was a brand new coil that came with it. It was the first thing I suspected, so I swapped it. Same problem after replacement.

New Coil, New Wires. Distributor cap looks good, as well as the rotor button
Im suspecting a ECU, hole in piston, burnt valve, or Crank sensor. Im sure it could be a million things, but I was running it hard when it happened. That could or could not play a role.

Anyone is welcome to put in their 2 cents.


Dumped Clutch 5500K
hit second gear, all hell broke loose.

Very rough idle, wont rev past 3000k in or out of gear.
massive exhaust leak in front of back wheels. No CEL to the eye.

kmcormick9

Park it on pavement and idle it and then let it sit. Any puddles forming anywhere?

Your best bet may be to take it somewhere with diagnostic equipment. A computer can usually pinpoint a problem faster and more accurately than a message board.

Aaron053191

When I bought the car, there was a brand new coil that came with it. It was the first thing I suspected, so I swapped it. Same problem after replacement.

New Coil, New Wires. Distributor cap looks good, as well as the rotor button
Im suspecting a ECU, hole in piston, burnt valve, or Crank sensor. Im sure it could be a million things, but I was running it hard when it happened. That could or could not play a role.

Anyone is welcome to put in their 2 cents.


Dumped Clutch 5500K
hit second gear, all hell broke loose.

Very rough idle, wont rev past 3000k in or out of gear.
massive exhaust leak in front of back wheels. No CEL to the eye.

rjr162

Weird you're not getting a CEL. The one time I tried to rig up a circuit to bypass the EGR completely, it worked fine until I was going up a mountain and the ECU went into limp and limited my RPM's just like yours (97 Based).. but that was OBD-II. Not sure if the 91's will do that, plus you'd have a blinking CEL, or a CEL at least

Aaron053191

Further Inspection:

There was no Bulb in my Check Engine Light, so I put one in it. I still have no CEL on now that it is correctly working. We have completed a compression check on each cylinder. All have checked out fine.

We are assuming that it has jumped time, I peeked at the Cam gears but couldnt see any noticable difference in them. Even at one tooth off it wouldn't be running as bad as it is. My friend whom owns the garage believes that it may have jumped on the crank.

---------------------------------------
Is it likely that when one jumps time, it will jump on the crank and not the cams?

Feed back, lets hear it.

kmcormick9

When you dump your clutch at high RPM you are delivering a sudden shock load to your crank, which would cause it to momentarily slow down while the belt continues moving

Aaron053191

I love the fact that your answer is so direct. Right now that is what I am leaning on, I just have to wait on the chance to get it in a bay so I can pull everything apart and have a look.

Also, the timing belt is brand new. Even with the belt being new and real snug, such a heavy load could still cause it to jump time; I am assuming?

4norzn

throttle position sensor.
that or both outer wire on the connector to said sensor is backwards from each other.

kmcormick9

It shouldn't. That's why there are big *** teeth on the gear and the belt and a tensioner to keep those teeth engaged under heavy loads. But it could.
Turn the crank by hand and inspect the belt for missing or damaged teeth.

Also sensors could be the culprit which is why you should hook it up to a diagnostic computer.

4norzn

hooking the car up on a diagnostic machine will not yield anything. you have to jump the connector under the hood close to the coil.

op before you break it down, check the tps. its on the throttle body. connect a multimeter/ voltmeter on the tps connector while its connected to the sensor. both outer wire. it should read .5v at close and 4.5v at wot.

its a lot easier than breaking it down. the first time around.

Aaron053191

Update*
After replacing the CEL Bulb, and still nothing. I was forced to have to drive it to work this morning at 7am. About 3miles into the trip, the CEL came on! First time I've ever been happy to see the CEL. It spit out code 43 which is" fuel supply system" I would imagine that this code is going to tell me about exactly where my problem is coming from.


Now for anyone who knows about this code, is there any particular failure that throws it more than others.

My total symtoms are:

Will not rev past 3000K
Very rough idle
Bucking and Jerking during the drive
Running rich possibly? Not real real sure.

Now from what I understand, the likely things are

O2 Sensor, Fuel Pump, Fuel Filter, or Injector(s)

Could a O2 sensor make one run this rough?

I've heard of worsened gas milage, but not anything this serious.

Targa250R

Sounds like the cam timing jumped.

I wouldn't spend a single dime on parts until you verify the cam timing at TDC.

egdaveboosted

Hey im having the same problem i got acel for the same thing I checked timing it's right and I talked to je import performance and they said they are 99% sure it's not timing ive replaced dizzy injectors harness ecu tps map cattilitic converter and plug and wires

1funryd

The code you are getting points to the 02 sensor, fuel pump, fuel filter.

Check those and download the online PDF manual so know how to properly diagnose the 3rd gen specific procedures.

You can download the manual from my site: www.1funryd.com at the bottom of the first page.

Aaron053191

Conclusion:

Jumped Time on crank by a few teeth, set code 43 " System Fuel Suppy"

The computer was convinced it was starving for fuel because it wasn't firing at the right time.

1funryd

Good to see you got it figured out.

Aaron053191

Yea man, I was starting to get worried. Now all systems are a go!