91GTABird

After installing the new ecm today(730) my car cranked and idled fine. I set my NEW tps voltage to .54v at idle. When i give it gas the voltage goes up but the TPS% wont go above .02-.05%. Im using Tunerpro RT. How can the TPS voltage go up but the TPS% wont go up.

There is 3 wires going to the TPS. Is there a specific wire(s) just for the TPS% reading?

Is there a specefic wire(s) for the TPS voltage reading? My car is still on the side of the road and i cant do anything.

When i give it gas the TPS voltage goes up but the TPS% wont. Because the TPS% wont go up the injector pulse width wont go up accordingly either. So with it being like that i can get enough gas to get it down the road.

Heres my other post pertaining to it.
https://www.thirdgen.org/techbb2/sho...60#post2207960

Grumpy

Did any rain get into the ecm connectors?. Just 1/2 a drop will fubar things.

Check the ecm grounds on the engine.

vernw

iTrader: (2)

Try looking at the ALDL definition file. I had one that was NOT set up to be a percentage for the TPS % and it did the same thing. Changed it over to being a percentage thru the TP edit feature, and now it's fine.

91GTABird

I had the hood open for while in the pouring down rain. What would you suggest.

I got a TPS for a Maf IROC b/c they didnt have any SD TPS's in stock and had to special order it.

The new MAF tps and the old SD tps are doing the same thing though. Could the MAF tps be the problem?

Thanks Grumpy

3.8TransAM

Grumpy makes a good point.

Forgot about those pia grds on the back of each cylinder head. Those loose or otherwise bad contact will cause all sorts of issues. Remove it and ohm it out end to end then reassemble it only after cleaning the ends and where it meets the block w/ some fine sandpaper.

I've taken to using the star style lock washers on them to hold them on. Due to all the garbage that goes on the one little stud back there on our cars, it needs all the help it can get.

later
Jeremy

91GTABird

If my TPS is fine what else could there be that would keep my Injector Pulse Width from going up? It PW wont go over .32-.54 at any throttle position.

vernw

iTrader: (2)

Did you see this reply?

91GTABird

yeah. Are you talking about this?

91GTABird

is there anyway i can get the pulse widths up enough to get home. All highway to there? What about open loop mode or something?

dimented24x7

iTrader: (2)

The percent tps is derived from the tps readings. The ecm takes the lowest tps reading and uses it as a base line to reference all the tps readings off of. If the reported tps voltage from the ecm goes up from idle when the throttle is opened, then the stored %tps will as well. I wouldnt see the tps preventing the pw from going up. The engine should still be fueled ok. Problem comes with things referenced off of the tps like the closed throttle SA table, TCC lockup, idle logic, etc.

dimented24x7

iTrader: (2)

That pic showing the tunerpro calc looks suspitious as well. The conversion for %tps is raw tps x .391 = %tps from 0-100%

TheGreatJ

Ignore the TPS % issue for now, as it's just a glitch with TunerPro and won't affect the way the car runs. As long as TPS voltage looks good, the sensor is functioning normally.

Having the wrong TPS will definitely cause problems though. I had a SD TPI 'Vette in the shop a couple weeks ago that would idle (although fairly rich,) but wouldn't accelerate at all. The car couldn't get out of it's own way. Someone had put the wrong TPS on it. Put your old TPS back on and see if it helps.

91GTABird

I have the old tps back on and the voltage is reading fine.

91GTABird

What doe sthe ecm use as a reference for PW?

91GTABird

I know the tps is working now b/c the ecm is going into PE mode when i stomp it. but still no fuel.

RednGold86Z

iTrader: (1)

The main load sensor for a speed density system is the MAP sensor.

Are you reading no fuel pulse width? What are the MAP readings?

If the TPS was acting funny, and the whole ECU is not functioning right, I'd go along the wire harness and wiggle things, and check the grounds and fused areas. Then check for sensor +5 volts at MAP and TPS, and check continuity on the ground wires to ground, and then measure sensor output voltage and check if it's in range.

If the engine just "sounds" like it's not getting fuel, then check the mechanicals (fuel pressure, filter, pump, etc..).

thirdgen88

All items in every ADS I've seen for 8D has errors like this... This will fix it: In the info for whatever item is in question, see if it is set to Divide... If so, then it probably isn't working (I think people thought that it was N/Factor).. If it is set to Divide by 2.56, change it to Multiply by 0.390625 (take 1/2.56)... It will work now..

91GTABird

Looking at the aldl Def. editor-TPS% the
operation says "Percent (Based On Range)".

You want me to change that to
Multiply ([X*Factor] + Offset)

Then change factor to 0.390625.

Do i need to change the offset?

RedNgold,

My pulse width wont go over .50 Msec at any throttle. My pump is pretty new as well is my filter. The car idles fine but under throttle it wont make any power and trys to backfire throught the intake.

thirdgen88

For the TPS % problem, yeah, change to multiply and 0.390625... The problem is that when people put in Divide and 2.56 they think it is going to take the data value, and divide it by 2.56 when in reality it is going to take 2.56 and divide it by the value.. I think the offset is zero on that one, so no you shouldn't have to change it...

91GTABird

Im fixing to go try it her in a few. Ill post back if it works for me. Thanks Thrd88!

91GTABird

Heading out now to go logg it again. Im going try and chek wires for continuity, cheack grounds, etc.

Can anyone host a log file for me. Or does anyone want me to e-mail them a short log file so they can look at it themselves?

Im starting to go nutz.

Thanks again for all yalls help.

91GTABird

Just logged it again. I now have the TPS% working. Thanks Thirdgen88.

i have a log file if anyone wants to view it.

My PW still wont go over .50 Msec.

My IAC is staying at 160 now and the car is trying to stay alive.

Tunerpro RT is showing a code 22 TPS low voltage.

The SES isnt showing any codes. Light works though

MAP is reading fine 97 KPA@ wot and etc.

Waiting on a volt meter and fuel pressure gauge.

91GTABird

ok im now getting a steady code 22 from the TunerPro RT and the ecm itself. Going to go try and find the correct tps.

91GTABird

Might have located the problem.

Im only getting 16-18psi. 42psi is what im supposed to be getting.

The fuel pump is not even 1 year old. But the funny thing is that Tunerpro is saying that im getting 14.8v +dc at my pump when my battery voltage is only 14.3v +dc.

Bad relay?

327_TPI_77_Maro

iTrader: (8)

Huh. I run with around 14.0 battery voltage, and 13.5 at the fuel pump

JP86SS

iTrader: (1)

Do you have an inline filter that could be clogged?
If the relay was bad you would not get the two second "pump on" when the key is first turned on. Once you crank and get oil pressure, the oil pressure switch would bypass the relay and hold the pump running.
Hope that helps.

91GTABird

yeah it does. thanks. Its too dark now so im going to have to wait till tommarow to change the filter. Think that the filter could cause that much loss in psi.

The fuel pressure is bouncing from @10-20(+-)psi.

JPrevost

Hold up, I think we're getting off on a tangent problem here but the pulse width should NOT be that low ALL the time. If TunerPro is storing your low TPS code, reset the ecm with the battery dance and see if the code is still there. It shouldn't come back.
Now for the mechanical problem, sounds like you've got some major fuel pressure problems. Pull a spark plug and check to see if it's lean. What is the o2 sensor doing and BLMs doing with you're suposed "low fuel pressure problem."
The fuel filter is imbetween the pump and injectors, clogged it's like crimping that line. Since the injectors are fine and the return line is almost never clogged (no filter) then you get almost no pressure. If the fuel filter is good check the pump filter.

91GTABird

Changed the pump and all is well now.

Thanks for all yalls help

Brian