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  #1  
Old April 16th, 2018, 22:20
blondejoncherokee's Avatar
blondejoncherokee blondejoncherokee is offline
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stroker issues- wideband reads somewhat lean but exhaust is super rich

EDIT: I think we had a tech misinterpret C02 for CO on the tail pipe readings. We originally thought the tail pipe was rich (He interpreted 13% CO2 as 13% CO) when in fact it is about dead right for 14.7 with 13% co2.


1998 XJ, aw4.
4.6 stroker
bishop Buehl pistons and rings and custom head
ported head with chevy LS valves,
comp cam 68-232-4
almost all new Mopar sensors- map, IAT , CTS, CPS, TPS
full 3" exhaust, and a bay header to replace my old stock cracked one.
injectors have been cleaned and tested. they are 703s.
BBK throttle body.
K&N intake with 6x9" cone filter.
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram

Last edited by blondejoncherokee; April 17th, 2018 at 12:32.
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  #2  
Old April 17th, 2018, 07:09
RCP Phx RCP Phx is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

What injectors are you using? What are the "fuel trim" numbers?
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  #3  
Old April 17th, 2018, 07:15
RCP Phx RCP Phx is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Your build sounds a lot like mine...........

I finally get to p/u my block today so I can get started, I talked to Russ the other day about where my heads and intake are and they're about another week out!
Here's my parts list............

2000 XJ block - decked, bored .030" over, and align-bored w/ ARP Main Stud kit

Clearwater Cylinder Head improved 0331 head - Bishop-Buehl port/polish/62cc chambers/LS1 intake valves/port match w/ ARP head bolts

2000 XJ intake manifold - Bishop-Buehl port match/bore TB 62mm

BBK 62mm throttle body

Banks Revolver header

Hesco water pump

Comp Cams 68-232-4 camshaft - Lift(.460" Int/.476" Ex) Duration(250 Int/256 Ex)

Rollmaster billet steel(crankgear induction hardened) double roller timing set w/ nine position crank gear (+8 to -8 degrees)

Cam bolt with custom length thrust pin(no spring), shooting for .008" of end play

Sealer Power lifters

HarlandSharp 1.6 roller rockers w/ ARP rocker studs

Scat stroker crankshaft

Scat/Bishop-Buehl Chromoly 6.125" connecting rods bushed for free-floating Chevy wrist pins

Auto Tec 4032 Forged pistons/ -22cc D-dish w/ Chevy wrist pins and 1.385" wrist pin height

Sealed Power Moly piston rings

Clevite main/rod/cam bearings

FelPro gaskets/seals

ARP flex plate bolts

Brown Dog motor mounts

Crankshaft, connecting rods, pistons, wrist pins, flex plate, and harmonic balancer all balanced

Reciprocating parts - connecting rods, pistons, and wrist pins I weight matched to within .25grams across all 6 set combo's

Custom 2-1/2" header to downpipe adapter w/ O2 bung for my LM-2 A/F meter

...............the rest of the thread: http://naxja.org/forum/showthread.php?t=1140839
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  #4  
Old April 17th, 2018, 07:45
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RWKHausSupply RWKHausSupply is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Quote:
Originally Posted by blondejoncherokee View Post
exhaust is reading super highly rich out the tail pipe
Oil seems to be getting in the gas
wideband will be reading slightly stoich to lean when exhaust is reading 13% fuel which should be closer to 1-2%.

The exhaust reads super incredibly rich when we hook up my buddies tail pipe probe, but the wideband is reading lean and it appears the PCM is dumping alot of fuel.

Ive fixed exhaust leaks, but if I had them why would tail pipe read super rich and downpipes wideband read lean ?

If it helps
4.6 stroker
bishop Buehl pistons and rings and custom head
ported head with chevy LS valves,
comp cam 68-232-4
almost all new Mopar sensors


leaning towards a bad wideband and or a bad PCM.

another odd ball thing , is that in my data logging, the coolant sensor even though its new mopar reads like 70* when the dash reads like 160-170 and the engine is obviously warmed up.

I am going to check yet again for exhaust leaks and I am waiting for a new wideband. Just at a point where its really tough to figure out what it going on with this thing.
What wideband? I have never seen one register a % of fuel?
What are the true ratio (IE 12.3 or 14.6, etc)numbers?
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  #5  
Old April 17th, 2018, 07:52
Rockwood Rockwood is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Did you test the stock O2 sensor/wiring?
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  #6  
Old April 17th, 2018, 10:12
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Tim_MN Tim_MN is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Quote:
Originally Posted by blondejoncherokee View Post
....... my data logging, the coolant sensor even though its new mopar reads like 70* .......
Good place to start. Seems to me this would keep the ECU in full rich warm up mode.
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  #7  
Old April 17th, 2018, 10:27
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lazyxj lazyxj is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Are you sure the catalytic converter is still working?
A super rich exhaust should cause the converter to get very hot and possibly burn up if run long enough with raw fuel flowing through it.

O2 sensors?, yes we have plenty of them.
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01 Sport, 4.6L Russ Pottenger. stroker, AW4, 4" lift, 33 X 10.50 KM2, 4.56-8.25 TruTrac, D-30-E-Locker with alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Frame stiffeners, Lots of armor, Towing baseplate. http://www.flickr.com/photos/lwade/c...7603770130683/
1997 Country, Mostly stock, 2" lift, Engine mods, Towing baseplate
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  #8  
Old April 17th, 2018, 10:53
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Quote:
Originally Posted by RWKHausSupply View Post
What wideband? I have never seen one register a % of fuel?
What are the true ratio (IE 12.3 or 14.6, etc)numbers?
no I have a AEM wideband, and we used a tail pipe sniffer yesterday to check for fuel in the exhaust . the sniffer has one of many outputs that is %unbrunt fuel, and my buddy said that value is normally 1-2%, and mine was 13% . the wideband at that point was between 14.2-14.5, slightly rich but very close to stoic
.

If it helps, I am running a full 3" exhaust, and a very very high flow cat .
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram

Last edited by blondejoncherokee; April 17th, 2018 at 10:58.
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  #9  
Old April 17th, 2018, 10:54
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Quote:
Originally Posted by Tim_MN View Post
Good place to start. Seems to me this would keep the ECU in full rich warm up mode.
odd thing is when we hook up my buddies snap on scanner was reading the coolant sensor and 02 sensors as just fine. But my data log shows like 70* when I log with live link after warm
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram

Last edited by blondejoncherokee; April 17th, 2018 at 10:58.
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  #10  
Old April 17th, 2018, 10:55
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Quote:
Originally Posted by Rockwood View Post
Did you test the stock O2 sensor/wiring?
I probably should. We checked/tested it with a snap on Solus at one point and it checked out fine.
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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  #11  
Old April 17th, 2018, 10:57
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Quote:
Originally Posted by RCP Phx View Post
What injectors are you using? What are the "fuel trim" numbers?
injectors have been cleaned and tested. they are 703s.
my tuner has tuned the thing for these injectors specifically to have them open as much as needed.

As for short term, it changes dynamically every few seconds in the data log, so I can try to upload the most recent data log.
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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Old April 17th, 2018, 10:58
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Quote:
Originally Posted by lazyxj View Post
Are you sure the catalytic converter is still working?
A super rich exhaust should cause the converter to get very hot and possibly burn up if run long enough with raw fuel flowing through it.

O2 sensors?, yes we have plenty of them.
I have a super high flow cat. Super high flow.
__________________
As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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  #13  
Old April 17th, 2018, 10:59
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

lets see if this works- this data log is from yesterday after clearing the adaptive and swapping in another new NTK front 02 sensor and a fresh mopar MAP sensor and fresh comp cams break in oil.

https://docs.google.com/spreadsheets...#gid=716319746
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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  #14  
Old April 17th, 2018, 11:02
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Updated the specs in the post
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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  #15  
Old April 17th, 2018, 11:04
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blondejoncherokee blondejoncherokee is offline
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Re: stroker issues- wideband reads somewhat lean but exhaust is super rich

Maybe this one will work for the most recent data log- analog 1 is the wideband:

https://docs.google.com/spreadsheets...it?usp=sharing
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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