P0121, new TPS and new connector didn't fix
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Senior Member
Joined: Oct 2016
Posts: 605
From: Thomson, Ga.
P0121, new TPS and new connector didn't fix
ok here's the deal:
Bought rhis 98 Blazer LT and have the following codes: P0121 and P0420.
Symptoms are:
High idle on cold startup, corrects itself within a minute or two of driving. Idles perfectly until I go to put it in Park. Then it stumbles and stalls out almost immediately and nearly every time I drive it. Starts right back up with no problem. Replaced the TPS and the connector with AC Delco parts. Absolutely no change in behavior at all. Not sure where to go from here.
Bought rhis 98 Blazer LT and have the following codes: P0121 and P0420.
Symptoms are:
High idle on cold startup, corrects itself within a minute or two of driving. Idles perfectly until I go to put it in Park. Then it stumbles and stalls out almost immediately and nearly every time I drive it. Starts right back up with no problem. Replaced the TPS and the connector with AC Delco parts. Absolutely no change in behavior at all. Not sure where to go from here.
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Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
ok here's the deal:
Bought rhis 98 Blazer LT and have the following codes: P0121 and P0420.
Symptoms are:
High idle on cold startup, corrects itself within a minute or two of driving. Idles perfectly until I go to put it in Park. Then it stumbles and stalls out almost immediately and nearly every time I drive it. Starts right back up with no problem. Replaced the TPS and the connector with AC Delco parts. Absolutely no change in behavior at all. Not sure where to go from here.
Bought rhis 98 Blazer LT and have the following codes: P0121 and P0420.
Symptoms are:
High idle on cold startup, corrects itself within a minute or two of driving. Idles perfectly until I go to put it in Park. Then it stumbles and stalls out almost immediately and nearly every time I drive it. Starts right back up with no problem. Replaced the TPS and the connector with AC Delco parts. Absolutely no change in behavior at all. Not sure where to go from here.
Thread Starter
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Senior Member
Joined: Oct 2016
Posts: 605
From: Thomson, Ga.
Thank you Les.
After posting this I thought to check YouTube about it and I found that a dirty throttle body can cause problems like this. So I got a rag and some throttle body cleaner and went to work. It was pretty nasty. But the result so far is that the code has not returned and it doesn't stall when I put it in park (but it still sort of stumbles).
I think I'll take the intake off my parts blazer and disassemble it for cleaning and swap it out as soon as I get a chance. Besides, there's a new spider in it 😁.
If it comes back I'll follow through with the sticky and post results.
Thanks again.
After posting this I thought to check YouTube about it and I found that a dirty throttle body can cause problems like this. So I got a rag and some throttle body cleaner and went to work. It was pretty nasty. But the result so far is that the code has not returned and it doesn't stall when I put it in park (but it still sort of stumbles).
I think I'll take the intake off my parts blazer and disassemble it for cleaning and swap it out as soon as I get a chance. Besides, there's a new spider in it 😁.
If it comes back I'll follow through with the sticky and post results.
Thanks again.
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bassn4$$
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Jun 18, 2011 05:36 PM
