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09-04-2018, 11:13 AM
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#1 |
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Registered User
Join Date: May 2000
Location: Alexandria, LA 71301
Posts: 1,451
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OBD code 21 & 87
My 94 Cheyenne 350/4L60E has 2 codes, 21-TPS signal high, and 87-EEPROM flash memory error. On 21, I changed the TPS (housing was cracked) before it had this problem, and all was well for a short time then truck started stumbling off-idle and idling high. Also What are effects of 87? No vacuum leaks, no miss, just hesitation & high idle. I notice a difference in shift points also. Anybody?
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-02 avalanche (daily driver) -66 gto ragtop 389/400 (garage queen, hand-me-down from dad) -72 Tribute Trans Am (6.0LS/T56 6-speed) in progress -2003 YUKON (Wife's) -71 gmc swb fleet (current project, gonna shave everything, bags, stuff w/ 20's, gen III powertrain) -48 3100 SWB - 12/31/23 LONG TERM Project |
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09-11-2018, 03:23 PM
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#2 |
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Registered User
 Join Date: Oct 2011
Location: Tucson, AZ
Posts: 639
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Re: OBD code 21 & 87
Still having the issue?
Have you tried hooking up a vacuum gauge and seeing whats it says? Saw this on another post, may help you get started. Hesitation can be a few things but good to start with a vacuum gauge.
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09-16-2018, 01:58 PM
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#3 |
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Moderator
 
Join Date: Jun 2017
Location: Greensburg. PA
Posts: 2,324
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Re: OBD code 21 & 87
Check the 10 amp fuse in the fuse panel labelled Trans...87 code can be set if this fuse blows...
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2025 Chevy Equinox 
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