IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: TurboCajun on November 29 2013, 01:58:29 PM
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I have been hearing some noise when in boost which sounds like knock but its not showing on scan, I went out and recorded a few hits with the power logger , 2 hits from a stop with alot of wheels spin and one in third gear and one just normal.
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have you verified the knock sensor is able to alert the ECM?
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are you running a stock maf or a Translator
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I don't see anything out of the ordinary on the 3rd gear pull.
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Steve I am running translator,
Earl on a WOT down shift it usually shows about 1.8 on the scan master and some other times I will see very low readings like .0? Its a fairly new knock sensor and torqued to 14 in.
today I pulled plugs and did a leak down test and all were good. readjusted the rockers while i had the valve covers off. I had three spark plugs that look unusual, on one side of the plug there were a dark orange/yellow.
Also I was studying the PL file and notice that the mph was slow to get up but the RPMs was high, my thought was maybe trans slipping, so I went and did another pull from a dry stop, ok tires start spinning and smoking thru first gear speedo is at 45 than jumps to 85 than back to 45 than jumps to 55, all the while the car feels like the tires are steady spinning without change, (I am hearing the knocking noise). so my question is could the converter be making this noise and slipping, because the motor seems to be running fine. normal driving I do not feel like the trans is slipping at all .
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There's some 'trick' to get converter slip to show on powerlogger. I can't recall how I turned mine on. I do remember it didn't make much sense but that might tell you if you have excessive drivetrain losses.
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click on "Adjust" in F3 and enter the following as a start
midgear (third gear) 48
high gear (4th gear) 31.5
Leave a zero in low gear.
then drive the car at cruise in third and fourth with the covnerter locked up at steady throttle. If the CS% are not very close to zero....adjust the numbers very slightly until you get it...that will be about as good as you can do
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Steve you may have to explain this in more detail , you lost me. I am assuming that the power logger has to be connected to the ecm to make the change or is this just changing what the power logger reads.
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Check your TPS reading at the top of each gear.
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Steve you may have to explain this in more detail , you lost me. I am assuming that the power logger has to be connected to the ecm to make the change or is this just changing what the power logger reads.
No, it does not have to be connected..jus t open PL, hit F3, click on Adjust and enter a value for 3rd and 4th gears...don't worry about first and second...leave them at zero. I think you can take one of your existing .dat files and look at it after you have put the values in and you will see CS% displayed on the graph page, second graph from the top on the right hand side of the page
The chip defaults to LV8 to set Power Enrichment so tps is not critical other than for programming the chip...normall y anything over about 2.5 on the tps is enough at wot for the load (lv8)to be high enuf to trigger PE
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TPS readings are low because I did not remove the floor mat ( I only do that at the track).
Steve-- I did what you said and the first log I pulled up the % was at 45 and as soon as I moved to next frame it went to 0% and never changed again, I even tried other logs and they all show 0%
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does it show the converter to be locked on the data page?
Never mind that, it does not show third or fourth gear switches turned on so I am guessing they are bad in the tranny
Fix it so you can get wide open throttle with the floor mat in...
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no It does not show converter locked
IF I close power logger and reopen then click on the highest point of boost in the graft it gives me a number in the 280-290 range than as soon as I move to the next frame it goes to zero and will not change unless I close and restart PL again.
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you have no signal for third and fourth so the computer does not know what gear it is in so you will not see converter slip because it needs the gear to calculate the slip
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if you look at the logs, when I let off the gas and shift into OD it shows the converter lock up, but it doesn't show 3&4
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and that is why converter slip does not work-the switches appear to be bad in the valvebody
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I dont know what to think. just put everything back together and went for a ride , first hit it didnt make the noise, on the next ones it does. I cleaned my plugs yesterday and maybe after the first run they get to hot and start misfiring, the noise sure sounds like its coming from the motor. I am getting scared to run it.
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the switches you need are part number 8683502
If they don't go open when you're in gear you won't have lockup at all. CS% will never read 9
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I am assuming that 85 wiring is the same as 87, if so could it be a wiring problem being that both are not working, and who keeps these switches in stock
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Dave Husek has them. I priced them out at my local dealership a few months ago and almost passed out at how much more they wanted.
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Is he a vendor or has a website
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turbobuickperf ormance.com He's probably in bed right now though
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Earl's part number shows up in amazon and rockauto - for example.
Earl Brown Porn does not btw. :)
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Earl's part number shows up in amazon and rockauto - for example.
Earl Brown Porn does not btw. :)
Earl keeps it discrete and bangs 'em on webcam.
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Earl's part number shows up in amazon and rockauto - for example.
Earl Brown Porn does not btw. :)
I didn't use my last name back then. It also shows up on Ebay.
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would the senders not working effect the way the trans is working, or is it just to let the ECM know what gear it in?
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If they can't tell the ECM you're in 3rd and/or 4th the ECM won't know to lock up the converter.
Plus if you have a chip that scales back timing in higher gears it won't know either.
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Eric may bypass the switch input and use only mph...I am not sure
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I met with my trans guy and was telling him what was going on, and he started looking up parts ( the switches) and he said that there are two different part # and one is discontinued and the other is the one that yall gave, I dont know if he was able to the specs on brf. now my question is, without dropping the pan to find out if the switches are the same for both gears. could someone tell me. same part number for both 3&4 gear
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Yes, the 8683502 will work in both slots. It's the 'updated' part number. I'm current running a pair on my BRF transmission.
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Thanks Earl , so there are no mods to do to replace the discontinued one
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nope. they aren't anything more than a N.C. pressure switch.
Unscrew the old ones, put the new one's in, then install a drain plug in the pan so you won't have to wash ATF out of your hair again.
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nope. they aren't anything more than a N.C. pressure switch.
Unscrew the old ones, put the new one's in, then install a drain plug in the pan so you won't have to wash ATF out of your hair again.
Amen!
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the previous owner installed a drain plug, It was put directly in the middle of the pan, right under the filter, so when I open the drain it drips out because the bung it touching the filter, so it would take probably a week for it to drain, which means that I will be getting oil in my hair and down my arm into my arm pits.