95 buick lesabre help

95 lasbre seems to pulse or like surge Just got this car took it and got the scan done said the main things was the codep0640 quad driver module,code p0705 prindl switch,code p0300 misfire signal,code p0401 linear egr flow,code p0401 pintle position,code p0530 a/c presure switch,replaced the pwindl switch and the ignition module nuetral saftyy switch and after that it won't start so the replaced the crankshift sensor but the car still has the same pulse or surge to it also replaced the egr.any ideas? also on the lighter side how do you get the covers off the speakers on the front doors.any help is appreciated Thanks Lynn

95 lasbre seems to pulse or like surge Just got this car took it and got the scan done said the main things was the codep0640 quad driver module,code p0705 prindl switch,code p0300 misfire signal,code p0401 linear egr flow,code p0401 pintle position,code p0530 a/c presure switch,replaced the pwindl switch and the ignition module nuetral saftyy switch and after that it won't start so the replaced the crankshift sensor but the car still has the same pulse or surge to it also replaced the egr.any ideas? also on the lighter side how do you get the covers off the speakers on the front doors.any help is appreciated Thanks Lynn


The EGR basically causes a bad mix at higher RPM.. not 14:1 air:fuel mixtures.
The CRANKshaft sensor causes jerks, stalls, inability to start, Usually a 41 code.

With a new CRANKSHAFT sensor I would expect no stalling, etc.
There are some aftermarket harmonic balancer wheels that have given trouble in timing. Usually never running smooth at any time.


Surging .. Moderate or severe?
Surging? Possibilities are
fuel filter,
fuel Pump,
spark plugs/wires,
throttle position sensor TPS,
timing chain,
each of which have to be tested.

Most often for surging its ignition system, a plug fires normally for a while then fails for a while.
plugs/wires but there are other possibilities.
If it surges during higher fuel demands then look at fuel system.
If it surges at 40 mph.. or less then your looking for TPS, timing chain as long as it isnt ignition.

AS for the codes. How about getting a fresh start.
Try resetting the coputer clearing the codes (remove battery cable for 20 seconds) and drive it again to set new codes.
Please understand the PCM may not even help you in the long run if its responding to a sensor that is telling the engine to surge.

You may note the injectors, more often they show up boldly as bad causing poor idle conditions unless theres a wiring problem.

How many miles on the engine?
Is the coolant clean and staying full?

I believe the covers on the speakers are removable from behind the kick panel.. not sure there.
Perhaps someone could post on that.


Theres some ideas.. hope it helps.


GOOD LUCK..

Hi sorry for not getting back sooner had to have back surgery.the car has 146,000 miles on it.the coolent is clean and stays full.but now the thing wont start at all.I drove it back from getting the prndal switch and the crankshaft sensor replace.stopped got good gas and won't start finailly after pressing hard on the brake pedel it started and got it home then went for surgery.now it wont even start.called the place that did the work and they said bring it in.good thing I got aaa so going to take it and let them see what is what.and see if they are cons or what

got it towed to auto repair shop found out it was a starter enabler switch gone bad.omly charded me for the switch did'nt charge for labor which I thought was good of them.but know the oil light stays on and have the correct amount of oil and is clean but thats another post Thanks for looking and for the help

starter enabler switch???!!! WT*! What is that?

starter enabler switch???!!! WT*! What is that?

It's part of the VATS system. When the right resistance in the key is read by the TDM (theft deterrent module) or the computer, depending on the system year, the relay high in the dash on the firewall is enabled so that power can go to the starter. A rare failure from what I see in years of reading posts. I'm speaking from info abuot the 1998 model--the location is somewhere directly AC control level and maybe a little to the right, but it's all the way on the firewall. That would be hard to get to to try to steal the car!

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