Need help diagnosing problem (video)

spankle my wankle · 10-06-2010, 08:30 PM

I was driving to cincy when my car started losing power. I had no throttle response, could barely make it up hills, and the car would sputter under heavy throttle. No check engine light came on and none flashed would I grounded the connector. I've checked the following:
TPS (in range)
AFM (all values in spec)
Fuel Pressure (stayed around 35-40psi)
Spark on all plugs
I checked for vacuum leaks and found none
I even created a gasket "block off plate" for the acv to make sure it wasnt leaking

Now when i give it any gas or WOT i can't get it to go above 2000rpms. I've attached a video for helping diagnose this. Cost me $500 to tow back home so I'm pissed and ready to blow it up. The only thought I have now is either throttle body or clogged cat. Honestly I have no idea though. Thanks for the help.

FC Zach · 10-06-2010, 10:58 PM

I feel your pain brother, I'm dealing with the same BS on my car and want to blow mine up as well (anyone have a Barrett M107 available?!) You have checked all the things I would have recommend to. OMP? Is there a possibility that the AFM is bad and still checks out well with a meter? I have an extra AFM I just need to see if it is a S5. Did you check the TPS with a DVOM or did you just use the two light method? If not, do it with a DVOM and check for smooth movement across the throttle range.

djmtsu · 10-07-2010, 06:48 AM

Have you checked for fuel yet? I know you put in a new pump, but what about the filter?

My $200 offer stands!

jerd_hambone · 10-07-2010, 08:00 AM

FUEL.FILTER!!

Replace.it..My.old.S5.had.the.same.problem.

rx4ur7 · 10-07-2010, 05:30 PM

Sounds and acts like a blocked exhaust.

misterstyx69 · 10-08-2010, 10:25 PM

It's an S5..you are in LIMP MODE Dude!
that is what happens when your OMP is either on it's way out or Disconnected.
Check the CODES,,pull em up and see.

FC Zach · 10-09-2010, 06:30 AM

^ ^ ^ "No check engine light came on and none flashed would I grounded the connector."

Redshft · 10-09-2010, 07:11 AM

Quote:

Originally Posted by FC Zach

^ ^ ^ "No check engine light came on and none flashed would I grounded the connector."

Does the check engine light come on ever? I was working on somebody's car once and was thrown off because it wasn't throwing a code.. then I realized the light never came on. Pulled the piece out of the dash and found out the previous owner had pulled out the bulb.

FC Zach · 10-09-2010, 10:44 AM

Well that is definitely a problem, he may very well have the same issue.

jerd_hambone · 10-09-2010, 07:05 AM

Seriously! Get a new fuel filter! Haha

It's cheap and may fix the problem.

FerociousP · 10-09-2010, 12:36 PM

the light works, fuel filter was changed not long ago....

jerd_hambone · 10-09-2010, 12:57 PM

Quote:

Originally Posted by FerociousP

the light works, fuel filter was changed not long ago....

Was the strainer changed also?

Redshft · 10-09-2010, 12:55 PM

Well, assuming it's not in limp mode then, my next thought would be a clogged cat.

FerociousP · 10-10-2010, 04:24 PM

yep.

NoDOHC · 10-12-2010, 12:04 AM

Actually, the clogged cat is a distinct possibility.

I hate to say it, but check compression.

How is your oil pressure?

It could also be a bad connection in the wiring harness.

10-06-2010, 08:30 PM	#1
spankle my wankle Rotary Fanatic Join Date: Feb 2008 iTrader: (0) Posts: 185 Rep Power: 17	Need help diagnosing problem (video) I was driving to cincy when my car started losing power. I had no throttle response, could barely make it up hills, and the car would sputter under heavy throttle. No check engine light came on and none flashed would I grounded the connector. I've checked the following: TPS (in range) AFM (all values in spec) Fuel Pressure (stayed around 35-40psi) Spark on all plugs I checked for vacuum leaks and found none I even created a gasket "block off plate" for the acv to make sure it wasnt leaking Now when i give it any gas or WOT i can't get it to go above 2000rpms. I've attached a video for helping diagnose this. Cost me $500 to tow back home so I'm pissed and ready to blow it up. The only thought I have now is either throttle body or clogged cat. Honestly I have no idea though. Thanks for the help.

10-06-2010, 10:58 PM	#2
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN iTrader: (2) Posts: 2,267 Rep Power: 19	I feel your pain brother, I'm dealing with the same BS on my car and want to blow mine up as well (anyone have a Barrett M107 available?!) You have checked all the things I would have recommend to. OMP? Is there a possibility that the AFM is bad and still checks out well with a meter? I have an extra AFM I just need to see if it is a S5. Did you check the TPS with a DVOM or did you just use the two light method? If not, do it with a DVOM and check for smooth movement across the throttle range. __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

10-07-2010, 06:48 AM	#3
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	Have you checked for fuel yet? I know you put in a new pump, but what about the filter? My $200 offer stands! __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

10-09-2010, 06:30 AM	#7
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN iTrader: (2) Posts: 2,267 Rep Power: 19	^ ^ ^ "No check engine light came on and none flashed would I grounded the connector." __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

10-09-2010, 10:44 AM	#9
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN iTrader: (2) Posts: 2,267 Rep Power: 19	Well that is definitely a problem, he may very well have the same issue. __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

10-07-2010, 05:30 PM	#5
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson iTrader: (0) Posts: 231 Rep Power: 17	Sounds and acts like a blocked exhaust.

10-08-2010, 10:25 PM	#6
misterstyx69 .drives like MrMagoo! Join Date: Feb 2008 Location: Smiths Falls,Ontario iTrader: (5) Posts: 198 Rep Power: 17	It's an S5..you are in LIMP MODE Dude! that is what happens when your OMP is either on it's way out or Disconnected. Check the CODES,,pull em up and see.

10-09-2010, 12:36 PM	#11
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro iTrader: (2) Posts: 1,046 Rep Power: 18	the light works, fuel filter was changed not long ago.... __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

10-09-2010, 12:55 PM	#13
Redshft Rotary Fan in Training Join Date: Feb 2010 Location: Halifax, Nova Scotia, Canada iTrader: (0) Posts: 78 Rep Power: 15	Well, assuming it's not in limp mode then, my next thought would be a clogged cat. __________________ 2004 RX8 GT 1986 RX7 Track Car: 13B Bridge Port w/ Renesis Internals and Weber Carb 2003 MazdaSpeed Protege 1988 RX7 Convertible - new project 2004 Impreza and 2003 Legacy wagons for hauling groceries and The Dog

10-10-2010, 04:24 PM	#14
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro iTrader: (2) Posts: 1,046 Rep Power: 18	yep. __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

10-12-2010, 12:04 AM	#15
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin iTrader: (1) Posts: 855 Rep Power: 17	Actually, the clogged cat is a distinct possibility. I hate to say it, but check compression. How is your oil pressure? It could also be a bad connection in the wiring harness. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)