Question about 1991 Buick Century

1 Answer

Won't start after a short trip until cooled off

I have changed the following parts with new ones:
spark plugs
spark plug wires
ingnition module
coil packs
computer
transmission
fuel pressure regulator
crankshaft position sensor
TPS sensor
fuel filter
thermostat

I have tested the following and fould them operating correctly:
injectors
ECT sensor
park/neutral switch
EPROM chip in computer
alternator
water pump
all lights in the dash
fuel pump

As this vehicle is not equiped with an EGR system of any kind it is unusual to diagnose. I also installed a boost gauge to monitor for vacuum leaks and it appears to lose vacuum after it is fully warmed up and you press the gas, even slightly. It loses horsepower at this point, and will eventually die if left in park or neutral for any long length of time. It takes a long time to take off from a red light for the lack of power. If I floor it from a stop the engine will miss and sputter and sometimes dies. It seems to be an ignition problem, but I can't seem to find it. The only 2 sensors I haven't replaced yet are the camshaft sensor and the knock sensor, as I can't seem to locate them without taking the engine apart. Chilton's and Haynes have no information as to where these sensors are located. The engine after fully warmed up operates at -20 vacuum at idle and is almost zero if you press the gas pedal slightly.

canister purge valve solenoid? I am at a loss...

Posted by on

  • 1 more comment 
  • Mike Jul 24, 2009

    If the catalytic converter was stopped up it wouldn't run right, EVER.

  • Mike Aug 06, 2009

    Where are you getting your information from? The catalyst doesn't swell with heat!?! How in the world could it get worse with heat? The honeycomb design is so if there is a significant blockage, the exhaust pressure will either: A-blow out a flange or manifold gasket, or B-blow out part of the fragile honeycomb catalyst. Another thing, no one with any sense would suggest taking out the O2 sensor for any reason other than to replace it. Especially on a DIY network like this. You should know that it is reckless to tell someone to take out the O2 sensor without telling them that it is important to do it while the exhaust is hot otherwise chance breaking the sensor or ruining the threads..."Nostradamus" i am not, but maybe a touch more "in the know" than you. I am looking for an EXPERT on GM V6s, and I get clowned on by a 12 year old...

  • Mike Sep 15, 2009

    I took the car to A-1 Auto Electric, and they found that the voltage regulator wasn't working consistently when hot. They also found that one of the brushes on the alternator was worn out and didn't make good connection when hot. This is after I had the alternator and voltage regulator checked at 2 different places with machines. I guess the best thing to do in a tough situation like this, just take it to an expert. I got my car back the same day and the diagnosis was free. The engine stalled and won't restart due to irregular voltages comming to the IAC valve. Thanks for trying Honeymokey...

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 3,113 Answers

Sounds like the converter is stopped up.

Posted on Jul 03, 2009

  • honeymokey
    honeymokey Jul 25, 2009

    Wrong Nostradamus! It may be partially stopped and when it gets hot it will get worse. Remove the o2 sensor and run car then test vacuum.

  • honeymokey
    honeymokey Aug 07, 2009

    Like I Told you. You already know everything and nobody can tell you anything. It's obvious that you have a closed mind and know absolutely nothing about automotive mechanics. You failed to read that I said to test it, with the o2 out. It looks as if you have never passed any test in your life anyway, so keep you moronic dunce hat on that you wear so well. In touch with reality you are not, you are wasting money by guessing and throwing parts at it. By your post you seem to be less than twelve years old and starting to have a tantrum, because of your failed attempts to fix this simple problem.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

97 montero 3.5 6G74 no spark on cylinder one


Typically if your control module is bad, you won't developed a "localized" misfire, meaning on just one or two cylinders. So rule out that you simply got a bad part. Have you done a routine tune up? Spark plugs, wires (or coils), fuel filter, etc.? Typically you're going to want to start with plugs when diagnosing a misfire condition, followed by wires or coils (if it has a coil on plug set up). If you haven't, try that first.

Jun 01, 2014 | 1997 Mitsubishi Montero

1 Answer

My 1985 Skyhawk won't start. Cranks well but no start


BAD COIL OR IGNITION MODULE INSIDE DISTRIBUTOR RUN OHM TESTS TO VERIFY

Dec 08, 2012 | 1985 Buick Skyhawk

1 Answer

Landrover 1995 v8i wont start, has fuel at rails and spark and the starter turns the motor good, i changed the following already filters, plugs, coil, ingnition module, airflow meter. what could be th


Go to Autozone.com and register your vehicle for free, then you can get free fusebox and wiring details. Another site is alldatadiy.com

This sounds like you may have fuel at the rails, but do you know if the injectors are opening? You can assumed that the cam position sensors are working to fire the plugs and should work the injectors. There is a light test unit which may be borrowed to insert in the injector harness to determine if each connector is firing.

The throttle position sensor may be bad. You can check the connector end of this part with an ohmmeter to see if you have resistence when the throttle is moved.

Thats all I have for now.

Aug 16, 2012 | Cars & Trucks

1 Answer

1988 wrangler 4.0L auto won't start.


Your obviously increasing the magnetic flux of the coil.The coil stores a reserve voltage by pulling a plug wire you increase the KV,if this was a module problem you would even have spark, modules only recieves the signal, your coil has problems,make sure you have 12 volts at coil positive.

Mar 01, 2012 | 1988 Jeep Wrangler

1 Answer

1998 Pontiac transport van wont start:


Well you hit all the major ones, could be crank position sensor, ignition module, a bad coil pack (it should have 3), you need to check that you have spark to each plug while the engine is turning over (!!!be careful as this will hurt if you get shocked!!!), this will rule out coil packs. if you have no spark to any plug your looking at a bad ingnition module (which is what the coil packs bolt to). Hope this gets you on the right track!

Feb 08, 2010 | 1998 Pontiac Trans

1 Answer

No spark on a 1997 lt 350 most parts new but still no spark new opti, rotor,plugs,wires,ingnition-digial6plus(MSD),coil,module,coilwire,new grounds and still no spark open to ideas??? obd2 shows no codes


check to see if you have a part under the distibuter, this would be an ignition control module, this part does 4 things, 2 fuel based and 2 ignition based functions, this can be reomoved and tested at more auto parts stores.

Nov 02, 2009 | 1997 Chevrolet Camaro

2 Answers

I have an 89 k3500 454 tbi not getting fire to plugs. have fire to and from coil, aldo has new coil ignition module ingnition switch distributor cap rotor button distibutor and starter. but no fire to...


Check the resistance of the pick-up coil in the distributor. Reading should be between 800 to 1200 ohms. Disconnect the two wire connection at the distributor control module to measure the resistance.
Let me know.
Regards,

Mar 25, 2009 | 1989 Chevrolet K3500

1 Answer

No spark on 1988 s-10 pickup 2.8 new plugs,wires coil,cap and rotor.ran for about 20mins and then quit,wont start


It could be that the ignition module is defective and causing this problem.If it's the original ignition module it may be time to replace it. The ignition module can be tested by your local Shucks or Auto Zone usually for free, The module when its starting to go out will work fine until it warms up, it will then quit working because the coils inside of it short out, until it cools down. If the module is completely gone there will be no spark at any time, The module is inside the distributor under the rotor held in by a couple of screws,

Jul 21, 2008 | 1997 Chevrolet S-10 Pickup

Not finding what you are looking for?
1991 Buick Century Logo

264 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8211 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...