Few questions for you. 93 Bonneville. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-20-2004, 06:33 PM   #1
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Default Few questions for you. 93 Bonneville.

I am having a few problems with my car. I am going to be pulling the codes tonight to see what the problem is with the SES light. However I am curious to what would cause a transmission to not go into gear when initially starting it up. I have had the fluid clushed and changed twice in the past 30,000 miles. The first time was because it was over due and the second time what because I needed to change the tranny pan gasket. The car has a total of 155,000 miles on it.

Also when the car is started up it will have irratic idle for the first 2-3 minutes and then it will go away. I have a feeling that it is the throttle body needing to be cleaned, and it seems like an easy first step. The only problem is does anyone have a step by step guide to pulling the throttle body off? I have done a search and couldn't come up with anything that was useful, other than realizing it really should be cleaned every 60,000 miles. Also what gaskets are needed for this project? I am pretty familiar with cars, since my other one is my toy but I am used to the older cars with not so much crap in the engine bay. Thanks.
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Old 12-20-2004, 07:00 PM   #2
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yea check the codes and report them back so we can diagnose the problem

the TB dosent come off easily in a L27 car, I would say that there is a 45min-to 1 hr for someone doing it the first time, yes there is a TB gasket, and they sometimes fail and drip coolant
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Old 12-20-2004, 07:01 PM   #3
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How to clean a 93 L27 Throttle Body:

1 ) Remove the filter assembly. Two clamps take the convoluted tube off.
2 ) Remove the two 8mm bolts on the top of the TB.
3 ) Remove the Exhaust heat sheild, Two 13mm nuts.
4 ) Unclip the Accel and Cruise cables and unbolt the Throttle Cable Bracket.
5 ) Unplug the three connectors on the TB.
6 ) Remove the three 13mm nuts holding the TB to the UIM, it'* a good idea to hold the other side of the bolt with a combo wrench. Don't drop the TB.
7 ) Use a Phillips, Standard, or T15 to remove the three sensors on the TB.
8 ) Use Sensor Safe TB Cleaner to clean the TB. Clean the End of the IAC shaft.
9 ) Reinstall is reverse of removal, use a new TB Gasket.
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Old 12-20-2004, 07:08 PM   #4
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i will tell you that the heatshield is a bioach to get at and remove
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Old 12-20-2004, 07:13 PM   #5
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Quote:
Originally Posted by 1993 SLE
i will tell you that the heatshield is a bioach to get at and remove
Practice makes perfect I can have mine in my hand in 10mins with a hot motor.
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Old 12-20-2004, 07:18 PM   #6
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yes but i dont want to practice taking mine off, once to do a TB gasket was enough for me
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Old 12-20-2004, 07:37 PM   #7
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Thanks guys and I will let you know the second I find out what the codes are.
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Old 12-20-2004, 07:45 PM   #8
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I used to have a 93 up until 2 months ago. I cleaned the throttle body in it and did NOT remove the heat shield. It CAN be done without removing the heat shield. It just takes some patience. I suggest trying to remove the TB without removing the heat shield and if you discover it can't be done, then remove the heat shield. That heat shield can be a toughy.
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Old 12-20-2004, 08:02 PM   #9
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Quote:
Originally Posted by 1993 SLE
i will tell you that the heatshield is a bioach to get at and remove
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Old 12-20-2004, 11:21 PM   #10
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Alright so I have a wonderful code 44. It says that it is the O2 sensor lean. That means that I am not getting enough fuel into the motor and the oxygen sensor is reading lean. Am I right so far. This then means that I might have quite a few other problem, or just one the O2 sensor. Worst case senerio is that I have to see if there is an issue with the fuel pump not getting enough gas to the motor, or the fuel pressure regulator is an issue and I read that on this board a while ago, or one of the injectors is possibly clogged. If anyone has knowledge of this could you please let me know. I am hoping that it is just the O2 sensor. Now are there 2 in this car or just one? I have a Maxima that has 2 but it also has the ODBII computer and this one only has the ODBI. So I am thinking that it is just one and it is pretty near the motor maybe in the manifold on bank 2? Thanks a ton for any help you might be able to provide. I also have the gasket set coming in tomorrow so maybe on Sunday I will sit around and watch football while cleaning the TB.
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