Howdy all,

Just wondering if anyone could help out. TIA

dave

 

(1) fouling plugs or plugs covered with heavy dry black soot
(2) black fumes from exhaust when accelerating
(3) misfiring
(4) lower power
(5) poor mileage
(6) AFRs higher than 14.7 at idle and cruise
(7) AFRs higher than 10.5 on boost
(8) embarashment when 200HP Hondas beat you

 

Thanks Chuck,

I can always count on you for advise. Item 8 is yet to happen but the rest seem to point towards too much fuel. One thing i notice is then when i WOT on any gear there is some sort of hesitation then slow pull building revs!! I miss the times when i crunch the pedal and instantly i'm flying down the h'way. You reckon this could also be because of exessive fuel. I've just changed over to 8's and 9's NGK Plugs. Anyway this could be and issue. Thanks mate.

dave

 

My items 6 & 7 are really backwards unless you can see what I really ment.

Actualy a richer mixture will give a lower AFR.

They should be:
(6) AFRs lower than 14.7 at idle and cruise
(7) AFRs lower than 10.5 on boost

Plug temps either cause missfiring from being too cold, or pre-ignition from being too hot. I do not think its the plugs.

Get hold of a O2 wideband and check it out.

Now if your ignition system is going bad, it could cause misfiring.

 

Fd3s, That Souns Similar To My Symptoms That I Have On My Car Which I Believe To Be Faulty Secondary Injectors, Mostly Cause Its After 2750 Rpms. Just Wants To Bog And Pull Slowly Until Redline.

 

one thing i've noticed though of late is that in gear (all gears) wnd i rev up to 3k+ rpm the exhaust heat light starts flickering. Goes away when i ease off the pedal. Also i do not have the check engine light on my car which is weird. Been that way since i got the car (which is more than 5 years now) Any input much appreciated.

 

just another quick uodate. the heat light flickers more when on 2nd & 3rd gear at approximately 1850-1950rpm. Goes right away when i ease off the pedal. Also noticed its getting progeressively harder to start the car. It fires up but takes longer. does this make any sense?

 

Either your alternator is going bad, or your main engine ground is bad.
You should not have any voltage fluctuations like that.

Measure the voltage across the battery when idling, should be about 14.1volts.
Start the car and then remove one of the battery cables. The car should be able to run just off the alternator.

 

thanks chuck. WIll get that done tomorrow and report findings.

 

car runs fine with battery cables off. did a reset on pfc (i believe the procedure is the same as our ecu's-negative off and brakes for 10 seconds) and the car now pulls perfectly. any idea why this is happening ? Chuck?

 

If all you did was remove the battery gound for a while, reconnect, and now everthing works fine; then maybe the ecu had been subjected to sometype of high voltage surge or static electricity.

I have had similar things happen to my Pioneer surround sound decoder if lightning strikes were close by. Had to unplug and replug the unit to make it work properly. It was as if some short term memory in it was confused.

 

Switch your PIM back to normal.

 

Are you still getting the heat light flickering after the reset? On JDM cars the PFC flashes the heat light when it detects knock, since there is no check engine lamp like on the US cars. You can check the knock readings on the commander if you have it.

 

Thanks for the info. I have to look into that. Possible we altered the values on knock via datalogit. The strange thing though is, we plugged in a wideband 02 and the readings on idle indicates very rich. Upon coming into boost the readings indicate lean. Suspect fuel pump but changed out to high flow and still the same thing. I will be popping by the tuners next week and hopefully they rectify the problem. The light only flickers if i drive normally - gradual throttle and flickering starts at approx 1600rpm onwards until i let off. Weird huh?

I appreciate your input mate.If there's anything specific i should be looking at whilst at the tuners kindly chime in. TIA

Regards,

dave

 

I have similar symptoms, it almost feels like a slipping clutch, the boost gets up to about 14 and hesitates and oscillates, when getting up to high rpm's it's a dog, I know it is capable of better. However, there are rare instances where I get a nice second gear pull.