My 1995 Volvo 940 is running poorly. The engine (2.3L 4cyl. non-turbo) has a chronic problem with pinging and rattling. It's not the gas I'm using. It requires 87 octane according to the owner's manual, which is what I use and I go to different gas stations all the time. So that's not the problem. There is a computer on this car that controls the timing of the engine. In other words, it has self-adjusting timing and cannot be manually adjusted. I believe the computer has gone bad and is not adjusting the timing properly anymore, as the problem has slowly gotten worse over the past year. So my question has 2 parts...1) What is the name of the computer on this car that controls the adjustment of the timing? 2) Where is this computer located on my car?
2006-07-07 06:40:14 · 6 answers · asked by palebeachbum 4 in Cars & Transportation ➔ Car Makes ➔ Volvo
The car currently has about 152,000 miles. The pinging/rattling engine problem doesn't seem to be effected by weather conditions or how gently or hard I drive the car. Sometimes when I drive the car the noise is very pronounced. Then I'll drive the car later that same day and the problem is completely gone. The vast majority of the time though, it makes the pinging/rattling noises. The problem has progressively gotten worse over the past year overall though. I've had my Volvo mechanic, who is a great independent Volvo mechanic, and he can't find a real problem. He says the timing belt is fine. He suspects it's the computer. I'm a do-it-yourself mechanic and can change out the computer myself. But this is where I need your help. The name and location of the computer that adjusts the timing?
2006-07-09 09:06:20 · update #1
Forgot to mention that the "check engine" light has never come on.
2006-07-09 09:09:10 · update #2
dont purchase a computor first suspect the air mass unit [inline between the air filter and intake manifold] by unplugging this the computor goes into limp mode it will be harder to start but if it runs better on short test drive while unplugged the air mass unit is bad. {these arnt cheep and if you replace one you should replace the thermostat for the damper door inside the air filter housing, these fail in the hot air position and shorten the life of the a.m.u.] if the car runs worse with the a. m. u. unplugged you probably have a loose [worn out] timing belt that has jumped a couple of teethbut not so far that it wont start or run, this is not a valve benderbut it would be best toget it to a shop while still running. or if you are mechanicly inclined these timing belts are fairly easy to install yourself but get a good manual such as the haynes brand.
2006-07-09 02:36:22 · answer #1 · answered by hobbabob 6 · 0⤊ 0⤋
That's an expensive part to replace based on your analysis. There are other reasons besides a faulty computer that could be causing the problem, like a bad sensor, faulty sensor wiring, bad air mass meter, bad distributor...the list goes on and on.
Do you have the non-turbo? The turbo 940 requires 93 octane fuel.
Have you done all scheduled maintenance on the vehicle? Especially the major service at 60K and 120K? Have you tried a tank-full of premium 93 octane fuel?
Unless you know what you are doing, you should have a mechanic experienced with Volvos, or a Volvo owner who works on their own car, look the car over. If you are located in Long Island, NY, I can recommend three professional places to you, if you contact me. One guy is a Volvo dealer mechanic who works on them in his home garage, the other two are regular garages that does a lot of Volvo work.
2006-07-08 16:49:47 · answer #2 · answered by Jack 5 · 0⤊ 0⤋
i suspect its not the computer at all. All though you made need to get a new one anyway. you are experiencing a short circuit. check your wiring braids and inspect the connector housings. Engine heat, oil,soot, and dirt caught in the connection points will cause your automobile to sputter and hesitate, and as you said is getting worse. The insulation around the braids may have been compromised. Its an expensive problem and you need an expert Volvo mechanic to re-wire the braid. I had this problem with my 760 turbo and i was going bananas trying to figure it out. But good news i fixed it. Only long enough to wreck the car later racing a porsche 911.
OH WELL.
2006-07-11 07:28:10 · answer #3 · answered by tegodreaux 2 · 0⤊ 0⤋
a few things to check would be your flywheel\cranshaft sensor which is located on the top of the transmission they often go bad if there is a tear in the plastic casing.
try a higher octane just to see if it goes away.
and actually the timing can be messed with manually on this car depending on which ignition you have.If you have a square coil you have a regina system and the distributor is on the block.
There are 3 gears the timing belt runs on.The middle one runs the distributor.
If your distributor is on the head you have a bosh system and it is unadjustable.
2006-07-17 07:26:39 · answer #4 · answered by butchdalton 4 · 0⤊ 0⤋
WHOA,,, are U particular it really is a 95--940 ninety 4 replaced into the perfect year for 940 reason the substitute-over replaced into in 95 so it replaced into discontinued,,, or replaced into that a ninety 4 ROLL-OVER(nonetheless had some left so that they bought it in 95),,,only a lil records. they are going to nonetheless extra wholesome although,,,lol
2016-11-06 01:12:40 · answer #5 · answered by ? 4 · 0⤊ 0⤋
1)dont no the name of the computer 2)right side kick panel
2006-07-08 07:29:21 · answer #6 · answered by Anonymous · 0⤊ 0⤋