[DeTomaso] FW: NPC - Troubleshooting OBDII "Lean Bank 2" Code
JEFFREY COBB
jeffcobb1 at me.com
Sat Jan 14 11:15:35 EST 2017
Smoke machines are the best way to find a leak, though being a static search some findings get missed because of engine off.
WD 40 is fine but we found using it and the best ( Chemtool B 12 spray ) to be dangerous if enough of the volatile spray causes a backfire.
A backfire is always waiting for a fuel dose so it can scare you with sound and flames.
Try using a thick spray oil, like Wurth or Zep HS 2000.
The thick oil covers the vac leak which causes the vac induced rough idle or ? to go away until the thick oil gets sucked in and the flaw continues, also no danger of flames.
So you have found the leak and for three seconds saw/felt the engine run better.
Plus as the oil is going in you will hear a very high pitch scream.
I used Chemtool on a concours Ghibli SS 17 yrs back in my home attached wooded garage on a beautiful spring Sunday morning while the breakfast aroma enticed me to stop playing with cars, to find an intake leak and then the four two barrel Webers and engine top exploded up in fames. Hard to believe such a beautiful car would have gone up in fames and may have taken my home out with it.
Never again would I use a volatile spray to find a vacuum leak, unless I am working on someone else's car on a empty concrete park lot!
Jeff Cobb
On Jan 13, 2017, at 3:30 PM, j g via DeTomaso <detomaso at server.detomasolist.com> wrote:
> I have had similar issues with Porsche and Bmw ,
> I make a smoke generator adapter to hook to the throttle body and put
> .4 to 1 psi max of dense smoke into the intake . That allowed me to
> actually find a cracked sparkplug tube that was leaking vacuum on 2
> different boxsters .
> 2 ways I have used . first is use a Gm diesel glow plug and a quart
> paint can from home depot , a rubber pipe cap with hose clamp sized to
> fit over the throttle body or on the intake tube and some clear vinyl
> tube , ( look up smoke generator leak detector on youtube .
> compressed air through a regulator is used to move the smoke . I used
> the smoke fluid from Halloween smoke generators instead of baby oil .
> The next thing I did was purchase a cheap smoke machine on ebay and
> machined a nozzle and nipple for the clear tube to attachA(c) to the
> output of the smoke machine (very hot output nozzle on the machine )
> .
> Prop the throttle valve open plug the pcv breather if it is outside
> of the smoke loops the smoke will find a crack or leak in the pcv tubes
> . connect a 6 to 12 volt battery charger onto the glow plug and
> hook up the compressed air , or turn on the smoke machine use a laser
> pointer and or a light and point it every where you can to look for
> smoke coming out somewhere other than the exhaust tail pipe . that's
> your leak.
> jg
> __________________________________________________________________
>
> From: Larry - Ohio Time <Larry at OhioTimeCorp.com>
> To: detomaso at server.detomasolist.com
> Sent: Friday, January 13, 2017 2:52 PM
> Subject: [DeTomaso] FW: NPC - Troubleshooting OBDII "Lean Bank 2" Code
> Yup a vacuum leak. Spray the hoses with some WD40 to see if you hear a
> RPM
> change. If this does not identify the location you can get it
> smoked,(no
> were not in Colorado). It is a machine that pumps smoke into the motor
> and
> hoses, when it is not running, to help you pinpoint the bad spot.
> YouTube has videos on how to make a smoke machine (No not that kind
> again).
> I have not made one yet, but it is on the project list.
> Larry (up in smoke) - Cleveland
> -----Original Message-----
> From: DeTomaso [mailto:[1]detomaso-bounces at server.detomasolist.com] On
> Behalf
> Of Paul Timko
> Sent: Friday, January 13, 2017 2:43 PM
> To: [2]detomaso at server.detomasolist.com
> Subject: Re: [DeTomaso] NPC - Troubleshooting OBDII "Lean Bank 2" Code
> Sounds like a vacuum leak. I had a similar problem on my BMW.
> Paul
> #9270
> On 1/13/2017 1:26 PM, Doug wrote:
>> Hi Guys,
>>
>>
>> I'm asking "the collective" for ideas on where to go from here on
> a
>> problem with my 1998 Mustang Cobra.
>>
>> About a year and a half ago, it started throwing a P0174 "Lean
> Bank 2"
>> Check Engine code and I've done the following in an attempt to fix
> it.
>>
>> After each mod was made, it took about 180 miles of driving for
> the
>> code to reappear (since this code means the ECU hitting its max
> long
>> term enrichment limit).
>>
>> The car otherwise drives fine, so once this limit is reached, it's
>> still a very enjoyable drive.
>>
>>
>> Doug Braun
>>
>> Blue 73L #5505
>>
>>
>> DATE MILES REPAIR
>>
>>
>> Sep2014 87,000 Replaced IAC IAC (Idle Air Control) Valve -
> Autozone
>> Duralast TV228
>>
>>
>> Oct2014 88,000 Replaced Mass Airflow Sensor - Autozone/Cardone
>> 74-9524
>>
>>
>> Jul2015 105,000 Replaced Throttle Position Sensor - O'Reilly -
> BWD
>> EC3025P
>>
>>
>> Jan2016 111,095 Replaced both Upstream O2 Sensors - RockAuto/NTK
>> 22016
>>
>>
>> Feb2016 111,762 Replaced Intake Air Tract Temperature Sender
> (IAT
>> Sensor) - SMP
>>
>> Replaced Coolant Temperature Sender
>> (Sensor) - SMP
>>
>> Replaced Spark Plug Wires
>>
>>
>> Mar2016 111930 At this point, I took the car to a professional
>> Garage. They found a
>>
>> bank 2 intake manifold leak and
> replaced
>> the Intake Manifold Gaskets
>>
>> (manifold to runner + runner to head +
>> upper Intake).
>>
>> Replaced the Plenum Seal.
>>
>> Had Dr. Injector
>> [1][3]http://docinjector.com/ clean & flow match the Fuel
> Injectors.
>>
>>
>> Apr2016 112,105 Replaced Fuel Pressure Regulator - Motorcraft
>>
>>
>> May2016 112,385 I bought one new coil pack and used it to
>> temporarily replace each original coil pack.
>>
>> With the new pack in each location,
> the
>> code reappeared.
>>
>>
>> Dec2016 112,840 Replaced Fuel Pump Assembly - Airtex (sock
> filters,
>> wiring harness, case, flange & gasket)
>>
>> References
>>
>> 1. [4]http://docinjector.com/
>>
>>
>>
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