Question about 2003 Buick LeSabre

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Replaced map, maf, tp, crank, & cam pos sensors. new plugs & wires. Car dies while coasting, idles fast 2000 rpm at times, and surges or misses while driving. had car to 3 ind shops and 2 buick dealers. One dealer said catalytic converter bad causing all problems. Replaced and problem persists. Goin nuts over this.

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  • skipworthage Sep 29, 2009

    most recently : MAF or VAF
    TP
    MAP

  • skipworthage Oct 02, 2009

    P0108 MAP/Baro circuit high input
    (this code is showing twice)
    P0101 MAF or VaFA ckt range/perf
    P0121 TPS/Pedal Position Sensor A ckt range perf

    The dealer has now concluded that my transmission is causing all of the problems, although I have had a reputable trans tech w/30 yrs GM exp check it out and found no problem. The dealer said that it was probally the torqe converter. The trans tech did not break it down.

  • skipworthage Oct 02, 2009

    Very little salt locally. And the dealer said he won't "buy the job" if it doesn't work. He wouldn't refund or adjust bill for the catylytic converter that they said was the problem, but wasn't.

  • yadayada
    yadayada May 11, 2010

    then they are a shittt dealer.

  • yadayada
    yadayada May 11, 2010

    since the dealer will basically buy the job if the trans is not the problem go ahead and let them proceed, do u live in a state where they use salt on the roads?

  • yadayada
    yadayada May 11, 2010

    what are the specific trouble codes?, these sensors have about 12 diff codes that can occur for diff reasons of sensor performance.

  • yadayada
    yadayada May 11, 2010

    what trouble codes do u have?

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 148 Answers

SOURCE: engine stalls

your on the right route but also check egr valve

Posted on Jul 07, 2008

  • 245 Answers

SOURCE: 1992 Buick Regal Custom keeps dying in gear unless I double pedal

unfortunatly it sounds like you are having issues with the torque converter. it sounds like it is locking up all the time now. this requires the transmission to be taken out to change it i do not know what your experience is so not sure if you have the tools or knowledge to do it yourself.

Posted on Apr 30, 2009

ftw1952
  • 10319 Answers

SOURCE: 1992 3.8l buick lesabre keeps dying when the temp. outside is hot

I do think you catalytic convertor is bad

Posted on May 24, 2009

  • 196 Answers

SOURCE: Buick LeSabre makes funny sound!!!

It is a sign of a clogged convertor, but i happen to own the same car (with a series 2 3800) and had the same symtpoms going on when i bought if for the wife. Mine turned out to be a Exhaust Gas Recirculation Valve (EGR Valve).

To kind of get a feel for what is going on with the convertor, you can have someone help you but sitting in the drivers seat, with the car running. You go behind the car near the tail pipe. Now have the other person rev it up a little, not to much though. Put your hand but the tail pipe to see what kind of pressure the exhaust has. You can use another vehical to do the same thing to feel what things are supposed to feel like. If the convertor is plugged, the pressure of exhaust coming out will be a lot softer than it should be.

If after checking it as discribed above, if you feel it is plugged, grab a hammer, and bang the heck out of it. This will break up and loosen the clogged part without have to replace it.

There is no really good way to test a EGR vavle without a special computer. Replacing it however, does seem to me as the most likely repair for this vehical. It is located on the top of the drivers side of the motor. It look like a cylinder with a wire coming out of the cap, and is held on by 2 13mm nuts.

Good Luck....

Posted on Mar 24, 2010

  • 105 Answers

SOURCE: 2000 Buick LeSabre Will not start Replaced cam

Multiple engine misfire is related to the coils and the ignition control module. I have a 2002 with the 3.8 engine. It has three coils. I just went through this problem. I bought one coil and tried it in each position with no improvement. It was the ignition control module. Mine is located under the three coils. A relatively easy item to replace. Cost about $140.

Posted on Apr 19, 2010

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1 Answer

99 Isuzu Trooper RPM keeps racing! These sensors have been replaced; TPS, IAC, CTS, no Vac. leak. The RPM still races at normal operating temp. What sensor tells the computer the RPM of the engine?


redux1
after many posts, we see only 1 clue engine
MAF
the 6ve1 engine
that told me what engines. one word, mAF.
if just one MAF (no map)
so all air leaks are slow rpm caused by lean
but if pcm goes in to limp home mode.
it car race, due to loss of IAC controls
the engine does not run like you think
the CMP/Cke sensors,
if they die , the engine dies.
if they misfire, the engine misfires and slows and stalls'

are you using good scan tools real that see all factory codes. p1, p2xxx?
not just fedcodes, p0xxx?

the 3.5v v6 has a MAP and a MAF BOTH.
on some engines like this, the Map is for idle
and the mAF of for fast.
fooling many machanics
dual mode systems,
the MAF sensor is not very accurate at idle
is the reason for the dual mod
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Engine runs rough and stalls sets a p0068 code on a 05 dodge durango


P0068-MAMFQLD PRESSURE/THROTTLE POSITION CORRELATION
' Image
Theory of Operation
This DTC sets when an unexpected high intake manifold air flow condition exists that
can lead to increased engine speed and puts the NGC into a High Air flow Protection
limiting mode. The High Air flow Protection feature includes RPM limits for when a
Throttle and or MAP sensor limp-in fault is present.
When Monitored
During all drive modes.
Set Condition
If vacuum drops below 1.5Hg with engine RPM greater than 2000 RPM and closed
throttle. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
-VACUUM LEAK
-RESISTANCE IN THE (FS56) 5-VOLT SUPPLY CIRCUIT
-(FS56) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (Kl) MAP SIGNAL CIRCUIT
-(Kl) MAP SIGNAL CIRCUIT SHORTED TO GROUND
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-(FS55) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT
-(K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND
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(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
questions.?
1: hot or cold or both.?
2: low extreme RPM and high at idle.

400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
hot idle, if not , i fix that first.
keep in mind if not in closes loop and lean
all lean engine surge and guess what the ISC will add to the surge
because idle is way too slow, so the ECU open the ISC wider
and wider and its still too slow, so the ECU resets the ISC
this cause a worst hunt (surge)
the ECU adjust spark time and the ISC to get 800 rpm. (spec. look up yours)
so say , i see closed loop failed, OBD2 scan page 1
i look at the O2 sensor an its stuck lean.
if stuck lean and it really is (o2 bad?) then its lean and it will surge
.
examples.
1: i find 02 sensor bad, (only effects idle and light steady cruise)
2: i find fuel pressure at 15PSI , hopeless low .
3: i find all injectors clogged. and lean.
4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

the driving bog tells me,
1: scan the ecu ,get DTCs; do that first.
2: clean MAF if car has one, ask how..
3: check fuel pressure.


my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
MAF is air density EFI
MAP is speed density EFI.
apples and oranges diffr. so what engine.


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