L98 TPS adjustment

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Oct 31, 2004 | 02:09 PM

dieseltech

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From: West Des Moines IA

L98 TPS adjustment

Is it worth the time or effort to adjust the TPS from .54V to .60 or .65V on the L98

Oct 31, 2004 | 02:41 PM

Wayne88

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From: Bergen County, NJ

IMO, if its not broke don't fix it.

Oct 31, 2004 | 04:25 PM

65Z01

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From: SE NY

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That is good general advice but in this case, if you have a '85-'89 L98 that mod will give crisper throttle response and improve power at part throttle acceleration.

Oct 31, 2004 | 05:50 PM

1MoorTym

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From: West Islip New York

Quote:

Originally Posted by dieseltech

Is it worth the time or effort to adjust the TPS from .54V to .60 or .65V on the L98

I don't think so, considering the spec is .54 +/- .08 which is .46 to .62. It may, repeat may, give you better off idle repsonse but I don't really think you'll notice, nor has that ever been proven. Make sure you've within spec and more importantly that you've got max approx. 4.5 volts at WOT.

Oct 31, 2004 | 05:56 PM

6spd

Burning Brakes

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From: smithtown ny

i have 4.29 wot set at .60 i have a 91 is there something wrong???

Oct 31, 2004 | 06:38 PM

65Z01

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From: SE NY

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No problem with your '91 as the ECM will simply "learn" base idle and WOT regardless of the TPS readings.

Oct 31, 2004 | 08:10 PM

SunCr

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From: San Diego, Ca

Agree that nothing happens - as long as it's running right. If it isn't, fix whatever is wrong with it.

Oct 31, 2004 | 10:30 PM

Midnight 85

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From: Hellinois

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Quote:

Originally Posted by dieseltech

Is it worth the time or effort to adjust the TPS from .54V to .60 or .65V on the L98

I've got an 85 that had an off idle stumble that was driving me nuts. I set the TPS at .65 and it's a different car with no side effects whatsoever. Go for it.

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Oct 31, 2004 | 10:39 PM

6spd

Burning Brakes

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From: smithtown ny

when i bumped my idle to .65 i noticed when i come to a stop my idle goes up to like 1100rpm's then drops back down????? this happened as soon as i bumped tps

Oct 31, 2004 | 11:03 PM

#10

65Z01

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From: SE NY

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The problem may be due to your '91 ECM "finding" base TPS setting whereas our older ECMs just accept the value.

Maybe you would have better success by putting the TPS back to stock base reading and bumping base timing.

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