Question about Cars & Trucks
Olds. alero 2002 3.4lt. eng.wont start 55lb.fuel press. but no fuel in cylinder plugs are dried
First to do is check for 12 volts at the injector plugs with ignition on, if not, check the fuses. Pull the fuses and look at them, this does two things. First it shows you that the fuse is good, second, it will usually get rid of bad connections.. Check this to the ground to the engine or battery. Next would be putting a noid light in the injector plug to see if it flashes. If it doesn't flash and you have 12+ volts at the plug, you have to check for continuity of wires. Between the injectors and the Engine control module, Wire schematics required. If the continuity is good, I would suspect the Module is bad. BUT there are other checks to do first.
Posted on Jul 12, 2013
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Posted on Jan 02, 2017
SOURCE: 99 olds alero 2.4
I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.
Posted on Dec 04, 2008
With the new lock cylinder in it, turn the key on. The security light should blink. Leave the key on for 10 minutes, the security light will quit blinking and go out after 10 min. This will reprogram your security system and the car should start. Also leave a battery charger on it while the key is on, If the battery goes dead during the 10 minute reprogram sequence, you will have to start over again.
Posted on Mar 08, 2009
SOURCE: 2003 OLDS ALERO WONT START
Check to make sure the Security light in dash on right hand corner is not on. If it is on , your passlock is enabled. to dissable it turn your key on but not start it and wait for apx 10-15 minutes. this should re-set it.
Posted on Apr 15, 2009
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