Question about Chevrolet Malibu
I have a 1994 bucik Park Avenue Ultra The car dirve good then it cuts off the service engine light will come on and stay on for the duration of the trip. the car will start back up but now it will cut off and take a while for it to start back up, sometimes when im driving and give it gas it will stall unless i ease off the gas a slightly give it gas. whats the problem? I also have a 1994 buick Lesabre had a slight similar problem I was told its the throttle control sensor is it?
Posted on Jun 12, 2011
So the Security light is on or flashing in your vehicle and you are looking at 1 of 3 things. Either the vehicle won't crank over and start, It cranks but dies in a few seconds, or your vehicle shuts off while driving scaring the **** out of you. You have now experienced GM's worst security system ever created. GM's security, also known as Passlock Passkey or Vats.
There are 3 parts in this system:
Normally a black resister chip in key which "communicates" to the lock cylinder. Sometimes is hidden in the plastic part of keys in new models. Same concept, might say PK1 PK2 PK3 PL or something similar to that. The newer ones work on frequency. Same thing tho.
2.The LOCK CYLINDER
Inside there are pins that read the chip in the key or the part that reads the frequency on new models. This then "communicates" to the TDM)
Theft Deterrant Module-Sometimes called the "computer" or "brain". This is the part that sends the signal (**NOTE**) to your car and allows your car to start or continue running depending on your type of system.
If any of these parts are not communicating properly, your SECURITY light will come on and shut down your vehicle. The idea being, that without the chipped key or FOB key, the vehicle wont start and cant be "hotwired" or stolen. Pretty nice when working, but these systems are flawed and the average life is 6-10 years. Every single aspect of this system is expensive to replace and can only be worked on by "authorized" GM service men with out voiding warrenty. Most garages dont even touch them and if they do,
they will sell you every part they can before "fixing" the problem
*QUICK FIX TRICKS*
Try a spare key that is newer or used less. The pins wear down with use and so do the keys causing the security to fail.
(if not starting) turn the key forward 2 clicks till right before it would normally start, leave like that for 10 minutes. ( no less ) After 10 minutes, turn key back then forward and your car might start. I did this in my Buick for more than a year. Remember this is a temporary fix... If its shutting down while running, I'm sorry I have no quick fix...
Well since the lifespan of these systems are so short, and are extremely expensive to fix, and in my opinion far worse of a threat to owners than theives, my only perminant suggestion is to eliminate it completely. After a year of 10 minute tricks and a "key bypass" that lasted 2 months. I have only one good suggestion. After surfing the web for hours thru forums and websites i came across http://newrockies.com/passkey to the starter or injectors and so on. Thus eliminating the ENTIRE system COMPLETELY. I came upon a fork in my road. A TDM for $600 in my $1000 car or the $200 bypass. Or throw my car away. Lets say i now drive a Buick with the chip ripped out of the key and the TDM sitting in my glovebox for show
and tell. If you have any questions or anything else. Comment on this post
and i'll get an E-mail to reply to you. If you do choose to buy the bypass,
i have pictures of what a TDM looks like and will definately help you when
installing the newrockies bypass. Good luck
Here is a list of known effected cars that can be fixed with the
newrockies bypass. This is the same list from the site and updates
2003-2007 Hummer H2
1994-2003 Grand Prix
1996-2005 Grand AM
1994-1998 Trans Sports
1996-2002 Trans Am
1991-1996 Park Avenue / Ultra
1991-1996 Roadmaster Estate Wagon
1982-1990 Electra (all models)
1991-1993 Delta 88
1994-1997 Cutlass Supreme
1991-1996 Custom Cruiser
1995-2005 Monte Carlo
1994-1996 Caprice/Caprice Wagon
1995-1996 Impala SS
1997-2005 Malibu Classic
1985-1996 Fleetwood Brougham
1994-1995 Deville Concours
1994-1995 ElDorado Touring
Posted on Mar 29, 2011
Got a 1991 Grand Am that had the same problem and i just fixed it yesterday. The problem is the ignition system which consists of the coil packs, the ignition module and the crank sensor. The crank sensor sends a signal from the crank as it turns. The system is timed so that the right fuel and air mixture is correct per cylinder. The signal is sent to the ignition module which processes it for the computer. The computer takes the signal and control the necessary components such as the fuel pump and injectors etc. On this particular car the crank sensor sticks through a hole on the back of the motor exposed to oil and it started breaking down. It would run good until it get hot and the motor shuts down until it cools off. Crank back up like nothing ever happened and would repeat the process. Change the crank sensor and have some peace of mind...
Posted on Oct 15, 2012
OK, back again, I THINK I got it remedied,,, I repositioned the TPS sensor just a hair after tinkering with it for about an hour,, THEn I pulled the PCM fuse to reset the computer.. it appears that it has solved the problem. It starts up and goes right to 750 rpm and stays there,, it runs well on partial throttle , but sometimes under hard throttle it "bogs: just a bit,, I havent had it over 40 mph longer than a mile, so I dont know if the OD is working yet,,Ill keep all ya posted as the days progress..Im keeping my fingers crossed, I know Im on the right track,,M
Posted on Aug 14, 2012
I have run into this problem allot with the olds alero . i do about 3 to 4 a year i have tried new keys resetting the security system which you leave the key on till the light stops flashing. only fix i have found is replace the key and the cylender worked everytime for me and it runs about 125.00 if you do the work your self
Posted on Nov 22, 2011
Sounds like your coil pack is breaking down, it reconnects when it is cold but when it gets hot it breaks down. I would make it cut off and then run a check on the coil module
Posted on Jan 08, 2015
If its a gmc / chevy,, the Security system cutting the fuel pump off,,,, try resetting your fob,,,,"aka keyless remote".gm and chevy products are bad about doin this,, you may go to a dealer and have a new key made ,,, that has the chip in it,,, they do go bad
Posted on Sep 11, 2014
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