My FC is chugging along (not good)

djmtsu · 04-20-2009, 05:34 PM

On the way to DGRR my FC began to miss a little, then the exhaust started to sound weird and it was losing power. We tore out the plugs and did a poor mans compression test. Both rotors sounded strong. Checked coolant and oil, neither are intermixed. Checked spark and its all good. Even put new plugs in.

I was getting a CEL flicker when it started acting up. And I get boost (although the needle is shaky). A few people at DGRR said to look into fuel issues. So before I go this weekend to attempt a resurrection, I would like some input.

S5 TII, no emissions, stock ECU with an FCD. Full exhaust, FD pump.

Here is a vid:

vex · 04-20-2009, 10:34 PM

your running on one rotor it sounds like. I'd check the rear housing to see what's going on there.

Phoenix7 · 04-20-2009, 10:54 PM

sorry man that sounds horrible....compression check?

IH8DSM · 04-20-2009, 11:46 PM

if it was fuel i wouldnt think it would run at all, or at least idle then die. If it was a intake or exhaust gasket it would run like crap or not at all. Ive never experienced a down rotor so im not sure on that one.

Rx-7fetish · 04-20-2009, 11:47 PM

Quote:

Originally Posted by vex

your running on one rotor it sounds like.

Ditto. Just because both rotors have good compression does not mean that both are getting fuel right. Having good compression, and the sound of that video i would say you have wiring or fuel issues killing one of your rotors. I would still try to get some real compression numbers though.

Rx-7fetish · 04-20-2009, 11:50 PM

Quote:

Originally Posted by IH8DSM

if it was fuel i wouldnt think it would run at all, or at least idle then die. If it was a intake or exhaust gasket it would run like crap or not at all. Ive never experienced a down rotor so im not sure on that one.

A wiring issue could cause one of the rotors injectors to act up, or bad injectors, or clogged, and so on and so on. Checked for vacuum leaks??

Whizbang · 04-21-2009, 01:06 AM

The needle for the boost gauge *shouldn't* be shakey either. That would imply some sort of possible electrical issue. Might not be the direct cause of whats happening. Could just be something else.

Have you confirmed timing? Also, get your hands on a piston compression tester, have someone crank the car and hold the shreader valve open so you can watch the faces.

djmtsu · 04-21-2009, 06:48 AM

When I free rev it, the boost gauge pulls down vacuum pretty hard. When I try to drive, it will go into boost, put the engine misses and sputters so the boost is shaky.

It is getting spark (ask Paul....he knows). I am hoping it is something simple, but I will not know until this weekend when I can get back to it. I plan on bringing a compression gauge along as well. I don't think it is *blown* since I have experience with a blown engine.

My5ABaby · 04-21-2009, 07:16 AM

I'm not sure I believe it's getting spark. I think we need a video of Paul testing it.

Boostmaniac · 04-21-2009, 08:47 AM

That horrible hammering sound, god that sounds nasty. Obviously related to engine speed.

I got nothing on this one that would be deemed "good news".

djmtsu · 04-21-2009, 08:59 AM

Anyone think it threw a bearing?

I plan to bring a set of coils, injectors, test the wiring, compression (with a tester).

Another idea Kevin had was maybe it knocked and chewed up the corner seals.

djmtsu · 04-21-2009, 10:16 AM

Fuckit. Towing it home this weekend. Reservation has been made. I am not going to try to do a driveway repair on my baby.

FerociousP · 04-21-2009, 11:19 AM

Quote:

Originally Posted by djmtsu

Fuckit. Towing it home this weekend. Reservation has been made. I am not going to try to do a driveway repair on my baby.

so you are going to tow it home and repair it in your own driveway?? lol

I'm not testing for spark again.

djmtsu · 04-21-2009, 11:34 AM

Quote:

Originally Posted by FerociousP

so you are going to tow it home and repair it in your own driveway??

Garage bitch.

Rx-7fetish · 04-21-2009, 12:54 PM

garage huh? well arent you special, ive been laying out in the mud for the past 2 days working on mine lol. seriously though good luck and i hope its something simple.

04-20-2009, 05:34 PM	#1
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	My FC is chugging along (not good) On the way to DGRR my FC began to miss a little, then the exhaust started to sound weird and it was losing power. We tore out the plugs and did a poor mans compression test. Both rotors sounded strong. Checked coolant and oil, neither are intermixed. Checked spark and its all good. Even put new plugs in. I was getting a CEL flicker when it started acting up. And I get boost (although the needle is shaky). A few people at DGRR said to look into fuel issues. So before I go this weekend to attempt a resurrection, I would like some input. S5 TII, no emissions, stock ECU with an FCD. Full exhaust, FD pump. Here is a vid: __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

04-20-2009, 10:34 PM	#2
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. Posts: 2,113 Rep Power: 19	your running on one rotor it sounds like. I'd check the rear housing to see what's going on there. __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group

04-20-2009, 11:46 PM	#4
IH8DSM RCC Contributor Join Date: Mar 2008 Posts: 610 Rep Power: 18	if it was fuel i wouldnt think it would run at all, or at least idle then die. If it was a intake or exhaust gasket it would run like crap or not at all. Ive never experienced a down rotor so im not sure on that one. __________________ 85 rx7 gsl-se - AA tags/ never ending project will never run

04-21-2009, 01:06 AM	#7
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	The needle for the boost gauge shouldn't be shakey either. That would imply some sort of possible electrical issue. Might not be the direct cause of whats happening. Could just be something else. Have you confirmed timing? Also, get your hands on a piston compression tester, have someone crank the car and hold the shreader valve open so you can watch the faces. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

04-21-2009, 06:48 AM	#8
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	When I free rev it, the boost gauge pulls down vacuum pretty hard. When I try to drive, it will go into boost, put the engine misses and sputters so the boost is shaky. It is getting spark (ask Paul....he knows). I am hoping it is something simple, but I will not know until this weekend when I can get back to it. I plan on bringing a compression gauge along as well. I don't think it is blown since I have experience with a blown engine. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

04-21-2009, 07:16 AM	#9
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	I'm not sure I believe it's getting spark. I think we need a video of Paul testing it. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

04-21-2009, 08:47 AM	#10
Boostmaniac Rotary Fanatic Join Date: Apr 2008 Posts: 182 Rep Power: 0	That horrible hammering sound, god that sounds nasty. Obviously related to engine speed. I got nothing on this one that would be deemed "good news".

04-21-2009, 08:59 AM	#11
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	Anyone think it threw a bearing? I plan to bring a set of coils, injectors, test the wiring, compression (with a tester). Another idea Kevin had was maybe it knocked and chewed up the corner seals. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

04-21-2009, 10:16 AM	#12
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	Fuckit. Towing it home this weekend. Reservation has been made. I am not going to try to do a driveway repair on my baby. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

04-21-2009, 12:54 PM	#15
Rx-7fetish Blue Blur Join Date: Jan 2009 Location: Windsor Posts: 211 Rep Power: 0	garage huh? well arent you special, ive been laying out in the mud for the past 2 days working on mine lol. seriously though good luck and i hope its something simple.