Help. Engine/Transmission Problems - Page 2

merrittjr · #16 08-21-2006, 08:37 PM

I'm having the same tranny issues in a 2001 Grand AM (except mine is slamming from N to D and when it's shifting from 1st to 2nd and 2nd to 3rd) with the IAT sensor code reading high. I replaced the sensor and it's still doing the same thing. Is there anything else I need to do? Do I need to reset the light? Do I need to replace the wires as well? It seems like it would be too much of a coincidence that the IAT sensor code would show up at the same time that the tranny starts acting up and the solution not being replacing the sensor.

xeroinfinity · #17 08-21-2006, 11:20 PM

If the IAT tripped the SES or Svs light then it needs cleared/reset.
when the Iat goes out it puts the car in a rich fuel mode by telling it that its 32deg, which can lead to other troubles.

But the wires dont need replaced unless they are broken.

Brass_GA · #18 08-22-2006, 05:47 AM

I'm picking up my new senser today so I'll post the results tonight. I doubt that the plug and wires are the problem. I looked them over for damage but the wires are good and the plug fits snug onto the senser.

Brass_GA · #19 08-22-2006, 02:06 PM

Well my new IAT is in but I haven't noticed any improvment. I'll clear any codes that might be stored just to double check but it looks like I'm headed for a tranny scan.

Brass_GA · #20 08-22-2006, 05:08 PM

Update:

I may have been too quick to judge. It might just be me but it sure felt like I was getting more power and better performance as I left work today.

Lets say that the IAT was my problem. Could that fault potentially cause damage to my transmission?

xeroinfinity · #21 08-22-2006, 07:22 PM

Not really, it probly just making your trans pressure raise and making it shift funny.

Keeping your trans fluid & filter changed regularly helps keep the trans in good running condition.
OUr manuals recomend the F&F changed every 50k mls(83k kilo) I try and do mine @ 30-40k. Doesnt hurt anything that frequent.

Hope you got it fixed though

merrittjr · #22 08-23-2006, 06:49 AM

Resetting the codes and changing the sensor worked for me. Thanks everyone!

xeroinfinity · #23 08-23-2006, 09:25 AM

No prob merrittjr, and youre welcome!

merrittjr · #24 08-23-2006, 04:27 PM

Well, I spoke too soon. It worked fine for a half day, now it is doing the same thing again. Any ideas?

Mr. Luos · #25 08-23-2006, 05:44 PM

Quote:

Originally Posted by xeroinfinity

OUr manuals recomend the F&F changed every 50k mls(83k kilo) I try and do mine @ 30-40k. Doesnt hurt anything that frequent.

I have been changing mine every 15K miles.
Otherwise it starts doing the same thing as described in this thread.

I think the tranny itself is just junk.
Look for a new thread about mine in 10 minutes.

xeroinfinity · #26 08-23-2006, 06:25 PM

Quote:

Originally Posted by merrittjr

Well, I spoke too soon. It worked fine for a half day, now it is doing the same thing again. Any ideas?

If that sensor keeps going out, and you are using a K&N (or other oil type air filters) it could hav to much oil thats getting on that sensor.

Quote:

Originally Posted by Mr. Luos

I have been changing mine every 15K miles.
Otherwise it starts doing the same thing as described in this thread.

I think the tranny itself is just junk.
Look for a new thread about mine in 10 minutes.

Yes the 4t40-45s are pretty weakass transmissions.
Nothing I can do about it

I'll check for your post.

You both probly hav some other transmision problems.
Thiers plenty go wrong in one of these 4t40's.

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