Idling trouble... I'm miffed.

vex · 05-20-2009, 06:20 PM

I confirmed that a large portion of the exhaust smoke I'm seeing is in fact fuel. I think my AFR may be calibrated in-correctly as it reads 11.0 AFR at 2k (in neutral) and it's pouring out grayish smoke like a chimney. At 1.5k it goes away, and the AFR says it's around 12, but comes back (not as prominent) around my 1k idle.

vex · 05-21-2009, 06:48 PM

So I ended up melting my MAP line... oops.

I replaced and plumbed it into a port away from the turbo and took a chisel and bent/capped off the port by the engine. I figure the penlum after the throttle body will see the same vacuum numbers that the original port did, or at least be some what close.

I do not think the bent/capped off port sealed correctly as I'm only getting around 14-15inHg at idle, though I know the car is capable of pulling close to 19inHg at idle. which leads me to believe that there might be a few little vacuum leaks that I can find and fix to eliminate them. The problem is I don't think anyone makes silicon vac caps and all the rubber ones I put on seem to dry out after awhile.

Though since I did relocate the MAP sensor to the new port my smoking problem seems to have vanished for the most part. I still think I may be running richer than I am being told by the AFR but I think that could be because of an exhaust leak from the EBAY special V-Band and the ATP V-Band adapter for the turbo.

Still burning oil, but the large quantities of smoke do not occur. They are however prominent portions of light smoke with a bluish tint that could easily be from the oil injectors or excess oil in the combustion chamber... though nothing to really consider extreme in nature.

FerociousP · 07-01-2010, 11:11 PM

McMaster has silicon Vac caps

vex · 07-07-2010, 08:10 PM

Quote:

Originally Posted by FerociousP

McMaster has silicon Vac caps

Wouldn't have mattered and the problem has been taken care of for some time now.

(The turbo and that specific port had maybe 1/2" of clearance at the most)

NoDOHC · 07-09-2010, 09:11 PM

I was thinking about this and I have a couple theories.

Is it possible that the AFR for your rotors is different, that one rotor is running rich and the other lean?

Typically the wideband port favors one rotor exhaust in what it reads (although not true on a turbo).

Does the wideband dance at all? One rotor may not be burning the fuel at all occaisionally, dumping raw fuel out the exhaust. I have seen engines with a weak face smoke white with fuel mist.

vex · 07-10-2010, 05:54 PM

I fixed this issue. It was the MAP line. Since the line had a large hole in it it was reading WOT which meant that the injectors were dumping fuel into the engine.

05-20-2009, 06:20 PM	#16
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. iTrader: (6) Posts: 2,113 Rep Power: 19	I confirmed that a large portion of the exhaust smoke I'm seeing is in fact fuel. I think my AFR may be calibrated in-correctly as it reads 11.0 AFR at 2k (in neutral) and it's pouring out grayish smoke like a chimney. At 1.5k it goes away, and the AFR says it's around 12, but comes back (not as prominent) around my 1k idle. __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group

05-21-2009, 06:48 PM	#17
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. iTrader: (6) Posts: 2,113 Rep Power: 19	So I ended up melting my MAP line... oops. I replaced and plumbed it into a port away from the turbo and took a chisel and bent/capped off the port by the engine. I figure the penlum after the throttle body will see the same vacuum numbers that the original port did, or at least be some what close. I do not think the bent/capped off port sealed correctly as I'm only getting around 14-15inHg at idle, though I know the car is capable of pulling close to 19inHg at idle. which leads me to believe that there might be a few little vacuum leaks that I can find and fix to eliminate them. The problem is I don't think anyone makes silicon vac caps and all the rubber ones I put on seem to dry out after awhile. Though since I did relocate the MAP sensor to the new port my smoking problem seems to have vanished for the most part. I still think I may be running richer than I am being told by the AFR but I think that could be because of an exhaust leak from the EBAY special V-Band and the ATP V-Band adapter for the turbo. Still burning oil, but the large quantities of smoke do not occur. They are however prominent portions of light smoke with a bluish tint that could easily be from the oil injectors or excess oil in the combustion chamber... though nothing to really consider extreme in nature. __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group

07-01-2010, 11:11 PM	#18
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro iTrader: (2) Posts: 1,046 Rep Power: 18	McMaster has silicon Vac caps __________________ '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

07-09-2010, 09:11 PM	#20
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin iTrader: (1) Posts: 855 Rep Power: 17	I was thinking about this and I have a couple theories. Is it possible that the AFR for your rotors is different, that one rotor is running rich and the other lean? Typically the wideband port favors one rotor exhaust in what it reads (although not true on a turbo). Does the wideband dance at all? One rotor may not be burning the fuel at all occaisionally, dumping raw fuel out the exhaust. I have seen engines with a weak face smoke white with fuel mist. __________________ 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)

07-10-2010, 05:54 PM	#21
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. iTrader: (6) Posts: 2,113 Rep Power: 19	I fixed this issue. It was the MAP line. Since the line had a large hole in it it was reading WOT which meant that the injectors were dumping fuel into the engine. __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group