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)

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode