What now? - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 04-26-2010, 12:40 AM   #1
Senior Member
Posts like a Supercharger
Thread Starter
 
Mad_Coachman's Avatar
 
Join Date: Dec 2003
Location: Baldwin,New York
Posts: 164
Thanked 20 Times in 13 Posts
Mad_Coachman will become famous soon enoughMad_Coachman will become famous soon enough
Default What now?

I have a 1997 SE with 130K miles.I got a p0122 code after cleaning my throttle body.I took the TPS out again and re-installed it.Still getting the code but now my tranny won't shift past 1st gear.While I had the airbox out I unplugged what I think is a PCM for the tranny.It is located in a big black box directly above the canister.It has 2 eighty pin(approx.) connectors.I also removed the chip and put it back in.I did all this because the car has been having misfires and p0171 codes.I did not disconnect the battery.My tranny was fine before I did all this.Please help.

Last edited by Mad_Coachman; 04-26-2010 at 12:45 AM. Reason: needed to put car in post
Mad_Coachman is offline   Reply With Quote
Old 04-26-2010, 01:18 AM   #2
Senior Member
Certified GM nut
 
SignOfZeta's Avatar
 
Join Date: Mar 2005
Location: New Milford, CT
Posts: 2,284
Thanked 16 Times in 13 Posts
SignOfZeta has a spectacular aura aboutSignOfZeta has a spectacular aura about
Default

That black box above the canister (and to the right of your airbox) holds your car'* main computer. I don't think your computer'* at fault; if you removed your throttle body, you may not have hooked up your vacuum lines correctly.

You should have these lines. Double-check against the vacuum diagram under your hood, as all this is just off the top of my head:
  • EGR purge solenoid (top) to throttle body (top)
  • EGR purge solenoid (bottom) to EVAP canister
  • Fuel pressure regulator and transmission to throttle body (bottom), via a T-adapter

Make sure these lines are intact and not broken. That could be the cause of your P0171 code, and perhaps, your misfires.
SignOfZeta is offline   Reply With Quote
Old 04-26-2010, 02:15 AM   #3
Senior Member
Posts like a Supercharger
Thread Starter
 
Mad_Coachman's Avatar
 
Join Date: Dec 2003
Location: Baldwin,New York
Posts: 164
Thanked 20 Times in 13 Posts
Mad_Coachman will become famous soon enoughMad_Coachman will become famous soon enough
Default

Thanks,I'll check that in the morning as It'* raining now and my ElCamino is in the garage and starting it up might disturb the neighbors(350 with thrush mufflers).

Last edited by Mad_Coachman; 04-26-2010 at 02:18 AM.
Mad_Coachman is offline   Reply With Quote
Old 04-26-2010, 08:23 AM   #4
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

The TPS will effect shifting because the pcm uses throttle info to determine when to shift.

First thing it appears you need is a new TPS sensor. After that, if you continue to have issues, please let us know and we can quickly direct you to the most common things. Like that P0171, if it doesn't clear soon, .... I'm an expert on that one.
BillBoost37 is offline   Reply With Quote
Old 04-28-2010, 12:49 AM   #5
Senior Member
Posts like a Supercharger
Thread Starter
 
Mad_Coachman's Avatar
 
Join Date: Dec 2003
Location: Baldwin,New York
Posts: 164
Thanked 20 Times in 13 Posts
Mad_Coachman will become famous soon enoughMad_Coachman will become famous soon enough
Default

Thanks Bill,I'll get back to it later in the week as I've been driving my '81 Caballero Diablo(El Camino) to work.I want to get the Bonne fixed before the weather gets hot though because my "truck" has no A/C and it'* no fun dealing with stop-and-go Brooklyn traffic with a stick shift!!!

Last edited by Mad_Coachman; 04-28-2010 at 12:52 AM.
Mad_Coachman is offline   Reply With Quote
Old 04-29-2010, 07:28 AM   #6
Senior Member
Posts like a Supercharger
Thread Starter
 
Mad_Coachman's Avatar
 
Join Date: Dec 2003
Location: Baldwin,New York
Posts: 164
Thanked 20 Times in 13 Posts
Mad_Coachman will become famous soon enoughMad_Coachman will become famous soon enough
Default

Quote:
Originally Posted by BillBoost37 View Post
The TPS will effect shifting because the pcm uses throttle info to determine when to shift.

First thing it appears you need is a new TPS sensor. After that, if you continue to have issues, please let us know and we can quickly direct you to the most common things. Like that P0171, if it doesn't clear soon, .... I'm an expert on that one.
Thanks Boosty,a new TPS did the trick.I took the car for a test run to Brooklyn last night and it ran great with no check engine light on.I filled up with gas right before getting home and the check engine light came back on.Upon arrival at home I checked my codes and the P0171 was back(somehow didn't surprise me).I cleared the code,.started the motor and it started running rough again.Looks like I'll need your expertise on P0171.I replaced the Crank Position Sensor and the Cam Sensor last saturday and checked the EGR for free pintle movement.
Mad_Coachman is offline   Reply With Quote
Old 04-29-2010, 08:54 AM   #7
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

The P0171 is a vacuum leak. Check all the vacuum lines as well as the EGR tube. Check everything around where you were working. Spray carb cleaner around and listen for a change in RPMs.
Danthurs is offline   Reply With Quote
Old 04-29-2010, 08:58 AM   #8
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

If you have done the LIM gaskets ever, you may be able to skip the carb cleaner. Most of the time I find bad EGR tubes (from EGR to LIM), you can't get the carb clean into the right area to change idle. Pulling the tube is the best method I've found for checking it, little of a pain....but you can get very well versed after 2-3 of them.
BillBoost37 is offline   Reply With Quote
Old 04-29-2010, 09:11 AM   #9
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

When you check the EGR tube and if you find a crack. Please take a picture of it and send it to me. I'll make up a write up on checking the tube and use your picture.
Danthurs is offline   Reply With Quote
Old 04-29-2010, 09:30 PM   #10
Senior Member
Posts like a Turbo
 
Tom_Sawyer_Man's Avatar
 
Join Date: Dec 2009
Location: Kitchener On.
Posts: 348
Thanks: 0
Thanked 0 Times in 0 Posts
Tom_Sawyer_Man is on a distinguished road
Default

DTC P0171 Fuel Trim System Lean

Diagnostic aids
  • Heated oxygen sensor wiring. The sensor pigtail may be routed incorrectly and contacting the exhaust system.
  • Poor PCM to engine block grounds. Ensure that the PCM grounds are clean, tight, and in the proper locations. Refer to Ground Distribution in Electrical Diagnosis.
  • Fuel pressure. The system will go lean if pressure is too low. The PCM can compensate for some decrease. However, if fuel pressure is too low, a DTC P0171 may be set. Refer to Fuel System Pressure Test.
  • Fuel injector(*): Refer to Fuel Injector Coil Test.
  • Vacuum leaks. Check for the following conditions:
    • Disconnected or damaged vacuum hoses. Refer to Emission Hose Routing Diagram.
    • Incorrectly installed or malfunctioning crankcase ventilation valve. Refer to Positive Crankcase Ventilation Valve.
    • Vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.
  • Exhaust leaks. An exhaust leak may cause outside air to be pulled into the exhaust gas stream past the HO2S, causing the system to appear lean. Check for exhaust leaks that may cause a false lean condition to be indicated. Refer to Exhaust System .
  • Mass Air Flow sensor. Disconnect the MAF sensor and see if the lean condition is corrected. If the lean condition is corrected with the MAF sensor disconnected, replace the MAF sensor. Refer to Mass Air Flow (MAF) Sensor Replacement .
  • Fuel contamination. Water, even in small amounts, can be delivered to the fuel injectors. The water can cause a lean exhaust to be indicated. Excessive alcohol in the fuel can also cause this condition. Refer to Alcohol/Contaminants-in-Fuel Testing Procedure .
  • Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
  • Damaged harness. Inspect the wiring harness for damage.
  • If the harness appears to be OK, observe the HO2S 1 display on the scan tool while moving connectors and wiring harnesses related to the engine harness. A change in the display will indicate the location of the malfunction.

Last edited by Purplehazeir; 05-01-2010 at 12:07 PM. Reason: Removed Links
Tom_Sawyer_Man is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
It died and won't start. Now have new motor and now this... '96BonnevilleL67 1992-1999 77 08-06-2007 06:50 PM
Now THAT was WIERD! (Now w/ pics) driverjohn2005 Everything Electrical & Electronic 61 01-17-2007 12:32 AM
We just lost a 93 SSEi. :( NOW WITH PICS DAY TIME PICS NOW willwren General GM Chat 90 06-04-2006 11:55 PM
My 92 SSEi now has chrome torque stars**NOW WITH PICS** 94SSEgold Your Ride: GM Pictures & Videos 17 12-28-2005 06:35 PM
18" LUV BABY!!!!!!! -I need rubbers now. (With PIX now) OLBlueEyesBonne Your Ride: GM Pictures & Videos 17 06-20-2004 10:24 AM


Tags
fuel pressure, p0171

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:19 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.