We've seen some issues with turbo bark on CA emissions trucks. What we need to know is does anybody that is having issues with the Boost stick also have blocked EGR/Fingers EGR stick?

I'm thinking based on past experience, that the EGR valve is activating causing a rapid drop in exhaust drive psi. When the exhaust pressure drops, the intake pressure back up causing the bark...

I've been running my truck with the BS for about 3k miles with no problems. I do have the EGR plate installed. Other than the EGR, FS, BS, and exhaust, the truck is stock. I'm not running a tuner yet.

Guys, I'm looking for CA emissions vehicles.

As I posted on the other thread,,I have the new predator update, (65hp tune) stock airbox and magnaflow catback. So far it's working fine, no problems. No issues at all so far,......

I have the BS, Predator 2.0 and E/A. Cat and EGR in stock configuration. Noticed immediate improvement on the low end with the addition of the BS and can actually hear the turbo now. I've been trying some different combinations of these two tuners stacked and also individually, as nothing I tried stacked seemed to work well. With the BS and the Predator on 100, I got a couple of 1093's trying to pass slower vehicles. For the last couple of days, I 've been trying just the E/A without the Predator. Did some hard accelerations today with the E/A on 5/5. No codes, no problems, but my SOTP meter says the Predator was performing better. I have not experienced anything I'd call a turbo bark. I think I had some bursting when I stacked both tuners at their highest levels. I don't have my rig dialed in yet, but I don't think the BS is causing me any problems. I hope this was the feedback you were looking for but be glad to answer any specific questions if I can help.

Dave

At the risk of jumping to conclusions, it would appear to possibly be more individual truck related than emissions group.

aegis, for the purpose of documentation here, please edit your post to indicate whether or not you have had any issues.

Sorry about that. I thought that the NE trucks were the same as the Cali. trucks.

Very similar, but apparently they react differently. Time will tell, but only a few incidents with CA emissions so far.

Sorry about that. I thought that the NE trucks were the same as the Cali. trucks.

Close, but no. Thanks for the input anyway.

Kennedy,,, no issues at all so far,works fine..

Just got back from trip. Boost stick= good. More power lower EGT's. Seems to throw 1093's easier. Even had 2 thrown on 40 tune, also got several 0101 codes. Good out weighed the bad by far. Might be time for shim mode.

i to am having the barking issues, or what ever it is called.
seems to be worse in 5th.this is with 15 to 17klbsload.
if you mash on it hard it will do it in 2nd and 3rd also.
going to try an unplug egr valve tonight and try it again tommorrow.
i am running the edg e-z on level 1 also.will report back
tommorrow after a couple hundred miles.
chays

Ca truck, stock egr, no stick, edge ez on level 1, tts exhaust, everything else stock, 65 degrees ambient, barks like a dog in upper gears WOT.

i have the boost stick and the blocker plate with the finger stick and no problem here i have the predator set at 65 and the edge/atitude set at stock and fueling at 3 but i have played with the edge power level and fueling noproblem then either if i can be any help by testing settings for you just ask
thanks
rob

Ok, just got done with my commute home. I get the bark when it shifts to 5th (between 1 and 3 barks before is returns to normal). Never at any other time. This is only during hard acceleration, WOT and 3/4. If I do maybe no more than 1/2 throttle or a little more it never does it. No other mods then what my sig states. It does not do it during the shift, it is right after the gear engages. Like maybe when the ECM changes to the lower power program for 5th gear. I tried everything (well almost), all the Low Boost settings between 3 and 5 for power settings 1, 2, & 3. I even turned off defuel for all shifts. Nothing made a difference. Samething everytime.

New Fuel Filter and air filter just changed Saturday and the OAT was 60.

I have been thinking of getting this (http://www.autoenginuity.com) to monitor my truck and such for other reasons. But I wonder if it would help to use this to data log everything while I am driving to see what might be going on. Let me know if I can help out anymore.

Once again Fingers great product. :ro) I want to help anyway I can to get this turbo bark issue resolved.

maybe i'll have to try wot not sure if i have looked for it there yet i will post my findings tomorrow tho

CA with Hyper L3 and bursts at WOT 3-4 & 4-5. On a greade WOT it began at 2-3. Havent unplugged EGR yet.

For the record: 05 LLY FE9 emissions, no EGR function, no cat, KD 4-5 exhaust no bark, no codes.

The bark will be easier to hear with an intake kit and much more muffler with stock intake.


Not to get off topic but:

If 1093s become more common, I would look at lift pumps first over shim mod. Harder acceleration = more inertia and harder for pump to get fuel. The more 1093 you set, the more likely you'll need to do the shim IMHO.

Unplugging the EGR fixed mine immediately.

Ordering a block off plate today......:ro)

I think that we will find that this is part of the reason why the "chip" mfrs have stayed away or gone away from adding boost. The "work around" may be simple, but the resources to explain it combined with some people's (respected) unwillingness to tamper with emissions devices along with potential legal implications...

Suffice to say, that I have heard this bark before on a certain tuner that implemented boost increase and quickly discovered that the EGR was causing it. My truck did not do it and a customer's did so he unplugged his and I plugged mine in confirming the theory.

madmax69, You'll want the Fingers EGR stick too. That or just leave the connector unplugged will have the same results as the plate and SUPER easy to reverse.

just leave the connector unplugged will have the same results as the plate and SUPER easy to reverse.

when do you unplug the egr? motor off, running,...?

thanks

kylant---unplugged and when truck is cool is best. id do it first thing in the morning, after the truck has cooled down over night, but that long a wait may not be entirely necessary.

John--sorry for the late response. My truck is CA emissions, I have 0 issues so far, EGR sticked and plated as it says in sig. I have done 5 WOT runs, basically drag racing without doing a boosted launch. I have had no bursting, barking, or anything else. Ive only got about 300 miles on the truck with the BS hopefully things wont change. The truck does have sort of a hiccup going from 4-5 but it was present before the BS was installed and it 1093'd 1 of the 2 times it has done it so Id say a lift pump is in order very soon.
thanks

p.s. John if you ever need something tested/experimented with, or want someone to do a sort of trial run with what theyve currently got on their truck let me know. I can usually do tests and give feedback just about at the drop of a hat. PM me or call 707 490 7379 and I should be able to try whatever it is you want me to do and get back to you within the half hour.

thanks
Jake

I was going to block my egr, should I do both? block and unplug?

thanks

I would do both, its sorta like insurance. The EGR can get stuck slightly open and the blocker plate would prevent anything that got by the EGR from going any further. And its only another couple of bucks, not like one would need to refinance to get the plate too.

Ok, so the fix for this barking problem seems to be to install the EGR block plate and of course the fingers stick to eliminate any SES codes. Is it recommended to test this theory by unplugging the EGR and make a few runs to see if issue is gone? Of course I understand that the SES light would come on during this testing.

Another question, did the EGR only come on CA emissions trucks?

Another question, did the EGR only come on CA emissions trucks?


No, all LLY and some 2004 LB7s have the egr.

One more quick question then. If I go ahead and get the block plate/finger stick to resolve this barking issue do I risk clogging up the CAT now?

I have a CA truck 2004.5 LLY. The only mods are on this truck are a 4 inch exhaust (cat back) and an extra "hoot method" hole in the front of the air filter enclosure. Other than that... all stock, even tire size.

After installing the Boost Stick I towed my 10,000lb fifth wheel. The turbo coughed or barked twice in quick succession getiing on the freeway onramp. I was accelerating firmly (pedal 3/4 pushed down) During the the actual bark the power dropped off. It occurred in 3rd or 4th gear.

Next run on the onramp with no trailer/empty bed. I accelelerated at nearly full throttle and the turbo did it's cough/bark again. This bark occurred in 4th gear. I then backed off the power to avoid another bark. The next run on the onramp was (No Trailer Attached) at moderate throttle and it had no bark.

Maybe a BS with less boost might work?, then again maybe CA emissioned vehicles react differently with it. I don't have a predator to check for codes related to the barks. In fact I don't have any tuners or fingers stick/blocker plate or anything. What should I do?

I like the idea of the BS just don't like the turbo barks. My truck ran perfect prior to BS plug in. Any ideas?

My initial response at this point would be that you'd need Fingers' EGR stick and a blocker plate to run w/o bark. Now I'm not sure what would happen if you continued to drive it this way. Maybe it would start to adapt to the increased flow. I kinda doubt it. I never paid much attention to the emissions junk other than how to get rid of it...

Thanks JK. If I waited for the new release of Diablo's ver 2.02 predator and used the EGR disable function and unplugged the EGR connector....would that get rid of the turbo bark or would I have to do all of the above and still have to install the blocker plate?

I really don't want to mess with the wiring on my truck. Electrical mods and me have never been a good match in the past. Plus my local dealer is pretty particluar about any mods whatsoever.

I have made like 8 full quarter mile passes today with my predator on 85 and the boost stick..I got no barking or anything..I do have CA emissions and do NOT have the egr blocked..Maybe its the tuners that are causing the barking witht he stick???

sean

So the sticker in your glove box has a YF5 on it?

Yes JK (IF you're asking me) I have a YF5 in the list. I'm curious. What does YF5 designate?

I drove my truck home from work today with the egr disconnected. Deffinetly no turbo bark no matter how hard I tried. I can feel the truck lose a little power on the shifts but that is it. It seems to run cleaner (less smoke) without the egr connected. Looks like it is time to order fingers stick and plate...

so, can you get away with just unplugging the egr and running the FS? is the egr block off plate just added protection "in case" the egr isn't fully closed?

in other words, will just unplugging the egr net the same results as the block off plate, assuming a cold motor?

JK, my BS just arrived today, i have a ca truck, and have the FS and block off plate ready for install. i will most likely tinker tomorrow after work, is there any sequence you'd like to see? (install one, test, then install another)

fingers makes some nice $hit. love those stickers

Gents! This is really strange. With EGR still on I did 4 qtr mile runs and many other WOT runs from various speeds and the barking sugnificantly reduced. It only did it once every run from 3-4 but the bark (burst or whatever it's called) was really brief, not as prolonged as before. The sound changed too. Sounds like it was sucking air.I did nothing to the truck except put miles on it. So I'm stumped. Could the truck be adpating? OAT differnce? Who knows. I havent tried it up a grade (more load) yet - will report back when I do. Oh...so cruizing EGT's down 100 but WOT up 100.

So the sticker in your glove box has a YF5 on it?


Yes...And when i last spoke with you via e-mail you said that is Ca emissions correct? Took it out again tonight and made more full passes with it and no Barking or anything..

When i put it on 100 and the stick it slips the tranny real bad..):h But i do think the 100 on the predator makes more power than the 85 and the stick..Just by the seat of the pants..

any one else experience less "bursting" the more you drive it?

My truck is experiencing the same problems in fact the exact same as cscoman and i have also tried everything he has except unplugging the egr. But the truck rocks until its past 3/4 throttle then it chugs and shakes with a deffinate decrease in power.
However EGT's did drop,turbo noise more pronounced, and better throttle response at cruising speeds all nice improvements in my oppinion. If the EGR block off fixes it this will be money well spent. I haven't seen improvements in the mileage yet I've only used one tank and they are starting the winter blend up here so mileage was down regaurdless.

but still no codes to speak of. JK how do I know if I need a liftpump(s) or a shim? What does the shim do?

J/K my bad..i put the stick in and just went out and beat on it, but didnt see any problems...Today driving for work i drove like 150 miles and when on the highway getting in to gas it does Bark and Burst alilttle bit..If i put my egr block off plate does that fix it? Or do we need to wait till something else for us CA emission trucks..

I should have drove the truck some miles before saying no problems..Sorry guys..

sean

You def. need the stick/blocker to control the barking. I have the PPE boost controller and I took theblocker off because I wanted to see if I could get my 04 lly to run as quiet as my 06 lly. That didnt work. I basically had to turn the boost stick off cause the turbo was barking really bad when towing. It would bark everytime I'd let of the throttle at 70 mph. Put the plate back in and it has all gone away.

How would you know if your truck is a CA emmision truck or not?

i installed the BS, FS, EGR plate, cat delete pipe and have a CA truck. i had thrown a p101 & p103 code at the same time once but i had the preditor set on 40 and the E w/ A on 5/5 and doing a 1/4 mile run. threw those codes along with a tcm malfunction (limped it)):h have taken the preditor tune off since. nothing else, yet. no barks

unpluged egr valve.
all is well.no codes no barking.:ro)
ran it over 350 miles.
just passing on my results.
thanx,
chays

CA truck. egr blocker plate, FS and boost stick. Stock exhuast. No box, no tunner.

Just finished 2,000 mile trip, half pulling a small trailer. No bark, no codes (well no light). Notice couple pounds higher boost at 70 and looks like around 100-150 degrees cooler EGT, but then again got a new cold air intake and the temperature was decidedly cooler than the last run. The slopes on cruise seemed to run a few pounds higher than before and cooler EGT. The couple times I went WOT I did not hear any barking.

Jim