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One thing that happened to me last week (may not be applicable to you) is that the exhaust side pcv disconnected and was causin my engine to idle unusually high. IAC was at 0 and throttle was at .45V
Weird huh?
Weird huh?
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S10 Blazer 4.3, turbo LX9 in its future...Originally posted by Mars
No 60šV6 at the moment
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well, that's two now... so you're suggesting the TPS % but not voltage being high is just a coincidence? it was perfectly fine last night and i have the log just afew seconds away...Originally posted by geldartb View PostComment
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maybe a bad or dying TPS?sigpic
99 Grand Am GT
3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
1357 cam 227 233 .050 dur 515 515 lift 112 lsa
15.232@88.85mph on stock 3400---New time to come
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always a possibility, but the output is fairly linear compared to the position of my foot and it's working correctly now...
some bad heat-cycling effects?Comment
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I think Jamey and Company at MythBusters looked at this one on their "Car Capers" Show...(See Attached Image)Originally posted by bszopi View PostAttached FilesComment
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I would keep my eye on the TPS sensor. My first experience with a bad one was right after I washed it with the throttlebody it was attached to in a Z28. The car was unruley after that. It idled high on startup, surged, accelerated and decelerated abruptly to the point of making me afraid to press the accelerator. Electronic engine management makes it possible for all sorts of weird things to happen.
I suppose most of you have heard about the runaway electric throttlebodies in one of the imports that have been alleged to have caused some deaths, including one where a car suddenly accelerated off a cliff. The driver survived to tell about it and explained that despite how hard he was pressing on the accelerator, the car could not be stopped, his wife died.
If I recall correctly, it was mentioned that an automatic disable of the throttle was not programmed into the PCM for when the brakes were applied. I can't find the words to address that.
That's one of the stupidist inventions in terms of risk in an automobile I can think of, a direct link by a computer to your throttlebody that can second guess your throttle input or the lack there of. PCM; "You've got one minute to make a decision because we're going somewhere like it or not".Comment
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It would be the reason for the high idle. His car was having a sugar rush...Originally posted by 60dgrzbelow0 View Post
-Brad-
89 Mustang : Future 60V6 Power
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Follow the build -> http://www.3x00swap.com/index.php?page=mustang-blogComment
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Robert... just to confirm that nothing has been stuck inside the mouth of the TB to make it physically stick and stay open...did your Gas Pedal drop to the floor when all of this was happening? Can you see any signs of scratches or dents...or even a loose Butterfly Plate inside the maw of the thing? Now THAT is something that would worry me...on the conspiracy side of the problem.Last edited by 60dgrzbelow0; 12-17-2009, 03:06 PM.Comment
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i was about to go pull the intake tube off and check, but realized i gotta go pick someone up from school...
but no: the throttle SEEMED to come all the way up, go all the way down, no catching at all, it's just that the ECM refused to acknowledge that i wanted it to idle and it didn't want to...Comment
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Its the old principle in Chemistry that "Like Likes to Dissolve Like...". So...its a Polarity issue...Water+Sugar = Sugar Water because they are a polar match... but Gasoline is Non-Polar, so the Sugar will not dissolve into the fuel. It might plug up a fuel line if ingested... but it won't ruin the engine in solution, etc.Originally posted by robertisaar View PostComment
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Joe... I know that the sensor pick-ups on each wheel of the 4th Gen F-Bodies are used via a tiny reluctor ring adjacent to the inner bearing race to provide rotational work the ABS to "grab and release" bookoo times per second to avoid locking up the wheels on skittish ground... So couldn't the programmable ECMs be modified with a table to handle that contingency as an automatic fuel pump cut-off if the TPS is at WOT and the brakes are depressed in vehicles equipped with ABS? The program logic on this would be simple to write as an elegant conditional loop:Originally posted by Joseph Upson View Post
If TPS {Throttle Position Sensor}>=WOT!
and If WR {Wheel Rotation} = YES!
and If BFP {Brake Fluid Pressure} = YES!
Then FPEP {Fuel Pump Electrical Power }= OFF!
else... BOTSWAKYAGB!
{Bend Over The Steering Wheel and Kiss Your Ass GOOD BYE! }
endIfLast edited by 60dgrzbelow0; 12-17-2009, 04:07 PM.Comment
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Drive by wire = Die by wireS10 Blazer 4.3, turbo LX9 in its future...Originally posted by Mars
No 60šV6 at the momentComment
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I hate DBW. The 08 G6 3900 max TPS is 86%. It hesitates if you jab the throttle (and I almost got hit once). So lame.
Don't tear anything apart. TPS isn't dying, IAC isn't clogged. Everything was doing what it should given a non idle TPS %. Reset the ECM by pulling the fuse 5 seconds. thats it
If its constantly happening, then replace the ECM or check wiring.
Ben
60DegreeV6.com
WOT-Tech.comComment
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I find nothing lucky about being a sore loser at a poker table. Also please don't drum this up like he did something special by driving a defective car. He knew there was a problem before leaving his driveway. If he got involved in an accident because he couldn't stop, then guess who we would be calling an idiot.Originally posted by 60dgrzbelow0 View PostLuck Trumps Skill... Like a S&W beats... Four Aces.
Robert is alive to tell us the story... So is my Son. So I'll take Luck... any time I can get it...Your local OBDII moderator
2000 Grand Am GT w/ WOT partsComment
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