DBW throttle quits after flooring it
05-29-2010, 08:26 PM
#1
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DBW throttle quits after flooring it After I floor the gas pedal the throttle quits working. If I turn it off then start it back up it works again.
Anyone know what might be causing this?
Anyone know what might be causing this?
05-29-2010, 08:46 PM
#2
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something is hitting the blade could be the tube is too small or a maf way too close (if your using one) but check and make sure when the blade opens nothing touches it if anything touches the blade, it will stop working
05-29-2010, 09:17 PM
#4
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The pcm should be the one that came with the motor. I don't know though bought it off ebay.
Q8-TECH, I'lll try what you said and see if that's whats wrong with it.
Edit: I moved the maf further away. I'll try it tomorrow. Its too loud with open headers this late
.
Q8-TECH, I'lll try what you said and see if that's whats wrong with it.
Edit: I moved the maf further away. I'll try it tomorrow. Its too loud with open headers this late
. Last edited by 69cutlassrkt; 05-29-2010 at 09:42 PM.
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05-30-2010, 12:48 PM
#9
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I moved the the maf further it dint help. Somebody else had the same problem heres what he said: "I changed the tune to a newer version and the problem disappeared." I don't know how to do that though.
Also if i rev it in park it doesn't mess up, only when I floor it in gear. And my diablo sport says unsupported vehicle when I try to tune it, so maybe my computer isn't the one that came with the engine. My PCM was tuned before I bought it. IT has emissions and TM deleted off of it.
Also if i rev it in park it doesn't mess up, only when I floor it in gear. And my diablo sport says unsupported vehicle when I try to tune it, so maybe my computer isn't the one that came with the engine. My PCM was tuned before I bought it. IT has emissions and TM deleted off of it.
Last edited by 69cutlassrkt; 05-30-2010 at 01:17 PM.
06-02-2010, 08:43 PM
#10
I moved the the maf further it dint help. Somebody else had the same problem heres what he said: "I changed the tune to a newer version and the problem disappeared." I don't know how to do that though.
Also if i rev it in park it doesn't mess up, only when I floor it in gear. And my diablo sport says unsupported vehicle when I try to tune it, so maybe my computer isn't the one that came with the engine. My PCM was tuned before I bought it. IT has emissions and TM deleted off of it.
Also if i rev it in park it doesn't mess up, only when I floor it in gear. And my diablo sport says unsupported vehicle when I try to tune it, so maybe my computer isn't the one that came with the engine. My PCM was tuned before I bought it. IT has emissions and TM deleted off of it.
06-03-2010, 09:25 PM
#11
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Are you scanning the car when it does this? When I first hooked up my 24x conversion a couple weeks ago, the throttle would work perfectly until I started the car and whacked the throttle. I could drive it around as long as I was REALLY easy and smooth with the pedal...up to about 13% TPS. Then the whole thing would shut down and the car would stall.
Turned out I was throwing a P1514 and needed to bump my Calculated Airflow vs TPS vs RPM table up a bit. I haven't had an issue since I doubled it.
Turned out I was throwing a P1514 and needed to bump my Calculated Airflow vs TPS vs RPM table up a bit. I haven't had an issue since I doubled it.
06-04-2010, 08:33 PM
#13
I'm having the exact same problem. If I slightly press the accelerator pedal, the throttle will work but if I go past 80% the throttle body snaps closed and will not move again until the battery is unhooked and then hooked back up. My engine is a 2003 6.0, but to get my A/C to work, my tuner switched to a 411 PCM. The throttle worked fine with the original PCM. Is this something that is easily fixed in the tune? Or is it a TAC module problem? Anybody know?
06-04-2010, 08:45 PM
#14
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If I'm not mistaken, 2003 was the first year for the 1MB PCM with the Green/Blue connectors. The 12200411 PCM with the Red/Blue connectors is a 512KB PCM. A 512KB DBW setup is not compatible with a 1MB PCM and vice/versa.
Jeff
Jeff
06-05-2010, 10:35 PM
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0411 PCMs are blue/red, but we knew what you meant 
When I was fabbing my system up, I scored a pedal, harness and TAC out of a 6.0L Silverado (I think 2003) to try for free. I didn't find any way to use it with my 2003 Corvette calibration and 2002 Corvette solenoid which is quite different from what you are using...that looks exactly like the system on my 2005 5.3L Tahoe.
The first problem was the TPS signals were all screwed up. Just sitting on the bench with power, the TPS was at 100% with the throttle blade closed and went down to 66% and then back up to 100% as I opened the blade with my finger. Quite a bit of trial and error (repinning different combinations of the 6 TPS wires) finally got the signals to be sane, but I was never able to get the TAC to open the throttle reliably without crashing. Move the pedal 'just' a little too quickly, and the whole system would shut down requiring a power cycle.
Bought a 2002 Corvette TAC and pedal, wired the harness back to the Corvette schematic and everything worked perfectly. Somewhere, someone knows what pedals, TACs, throttlebodies and calibrations are compatible, but I don't have a good handle on it and haven't seen a matrix. That info would be golden for those of us that are not working on production cars.
When I was fabbing my system up, I scored a pedal, harness and TAC out of a 6.0L Silverado (I think 2003) to try for free. I didn't find any way to use it with my 2003 Corvette calibration and 2002 Corvette solenoid which is quite different from what you are using...that looks exactly like the system on my 2005 5.3L Tahoe.
The first problem was the TPS signals were all screwed up. Just sitting on the bench with power, the TPS was at 100% with the throttle blade closed and went down to 66% and then back up to 100% as I opened the blade with my finger. Quite a bit of trial and error (repinning different combinations of the 6 TPS wires) finally got the signals to be sane, but I was never able to get the TAC to open the throttle reliably without crashing. Move the pedal 'just' a little too quickly, and the whole system would shut down requiring a power cycle.
Bought a 2002 Corvette TAC and pedal, wired the harness back to the Corvette schematic and everything worked perfectly. Somewhere, someone knows what pedals, TACs, throttlebodies and calibrations are compatible, but I don't have a good handle on it and haven't seen a matrix. That info would be golden for those of us that are not working on production cars.
Last edited by scottknight; 06-05-2010 at 10:37 PM. Reason: whoops, proofread before you submit
06-06-2010, 08:42 AM
#17
https://ls1tech.com/forums/conversio...-6-0l-lq9.html
CAL EDIT has posted this info...Looks like a good start toward sorting the problem[s]...
CAL EDIT has posted this info...Looks like a good start toward sorting the problem[s]...
06-06-2010, 02:07 PM
#18
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Thread Starter
These are the numbers on my PCM does anyone know what TAC module is the right one for it. My PCM has the blue/green connections. I am going to go by a chevy dealer tomorrow and ask.
Serv. No. 12576106
Hwd. No. 12570558
Serv. No. 12576106
Hwd. No. 12570558
06-06-2010, 02:26 PM
#19
I think the 12576106 PCM is for the 03-04 trucks, so that should have a 12588923 TAC Module.
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
06-06-2010, 10:25 PM
#20
On The Tree
Thread Starter
Thanks, the number on mine is 12590008. The motor is an 05 5.3l though. I may have been given a different year of PCM for my motor.
Last edited by 69cutlassrkt; 06-06-2010 at 10:30 PM.