Question about 1999 Chevrolet Silverado 1500

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In today's car how's the engine timing works?

In today's car how does the engine timing works? In the old days a mechanism with centrifugal weights and vacuum turned the distributor cap.

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Simply put,it is the function of a revolving magnet to inform the computer what position the engine is in for firing the is a lot more complicated due to the fact that air temp/pressure,air flow past a hot wire,load,road speed,engine speed,and a lot more besides are taken into other words if it aint broke dont touch......

Posted on May 12, 2010


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When accelerating at 55mph, I start to get front end vibration. It happens in all gears. Goes away when I take foot off gas.

Sounds like wheel balance, check front wheels for loss of weights outter and inner rim, alloy wheels have sticky weights steel rims have clamp on weights either can be lost....say if you clip the kerb/sidewalk or just through centrifugal force. A garage will check wheel balance and attach weights if needed.

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1985 F-250 with the 300CI 4.9L it starts and idles ok, but runs rough when given the slightest to full throttle. it has intermittent moments of power, that feel like the truck should run, but only last a...

That's the characteristic's of a throttle position switch cut's out at 55 mi per hr and stall's at acceleration..This is also a symptom of a throttle accelerator pump,not to mention water in the carb and or fuel system hope this help's.

Dec 04, 2013 | 1985 Ford F 250

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1995 LS 400: RANDOM/CYLINDER MISFIRE, CRANKSHAFT POSITION SENSOR , ECM I have a 1995 LS 400 that is misfiring and check engine light on. Mechanic read code and found P0300 Random Misfire, P0305 Cylinder...

Up to this point in time, mechanic 1 has only done some maintenance work on the car. Things that would be done from time to time to maintain the car.
Since you have lost trust in this mechanic, I would go to a different place and have them diagnose the codes. If the second place gives you the same recommendation you can decide what to do.
You can tell the second place you are getting a second opinion, or not.

Feb 15, 2013 | 1995 Lexus LS 400

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I have a 97 s10 blazer and replaced engine. The old engine was running but had a wrist pin knocking. The new engine started a few times but acted like it was only two cyl. and after replacing all sensors,...

Find the tan wire with the black stripe. It has a connector where it pops out of the harness near the distributor. if you can't find it look under the heater case in the passenger comp. disconnect it. You can now time your motor. Keep the idle speed down so the centrifugal timing weights don't throw your adjustment off. SHUT OFF the motor before re plugging the EST terminals back together.

HVS system is a different can of worms. It has a crankshaft sensor behind the timing chain cover which must agree with the "distributor" sensor position. I have no experience with this system.

May 26, 2011 | 1997 Chevrolet Blazer

1 Answer

I got an 87 jetta with a 1.8 I'm not shur how to time it or what the firing Order of the plugs and distributed are

The firing order is 1-3-4-2 (No. 1 cylinder at crankshaft pulley end).

Here is some information on how to check/adjust the timing:


Transistorised systems

Note: Accurate ignition timing is only possible using a stroboscopic timing light, although on some models a DC sender unit is located on the top of the gearbox casing and may be used with a special VW tester to give an instant read-out. However, this tester will not normally be available to the home mechanic


Run the engine until its normal operating temperature is reached.

On 1.05, 1.3 and 1.8 fuel injection engines, disconnect and plug the distributor vacuum hose.

If there are no timing marks on the timing cover and crankshaft pulley, unscrew and remove the TDC sensor or blanking plug from the top of the gearbox.

Connect a timing light in accordance with the manufacturer's instructions.

Connect a tachometer in accordance with the manufacturer's instructions.

Start the engine and run it at idling speed.

Point the timing light at the timing mark and pointer which should appear to be stationary and aligned. If adjustment is necessary (ie. the marks are not aligned), loosen the clamp retaining bolt and turn the distributor body to correct the ignition timing (see illustration 17.17).

Gradually increase the engine speed while still pointing the timing light at the timing marks. The mark on the flywheel or pulley should appear to move opposite to the direction of rotation, proving that the centrifugal weights are operating correctly. If not, the centrifugal mechanism is faulty and the distributor should be renewed.

Accurate checking of the vacuum advance (and ****** where fitted) requires the use of a vacuum pump and gauge. However,providing that the diaphragm unit is serviceable, the vacuum hose(s) firmly fitted,and the internal mechanism not seized, the system should work correctly.

Switch off the engine, remove the timing light and tachometer, and refit the vacuum hose (where applicable).

Run the engine to normal operating temperature, then switch off the ignition.

Connect a stroboscopic timing light to the engine.

Run the engine at idle speed.

Disconnect the wiring from the temperature sender (see illustration).

Increase the engine speed to between 2000and 2500 rpm, then point the timing light at the aperture over the flywheel. The timing marks should be aligned (see illustration 17.17), but if not, loosen the clamp bolt, turn the distributor as required and re-tighten the bolt.

While checking the ignition timing, the opportunity should be taken to check the temperature and knock sensor controls.

With the temperature sender wiring disconnected, increase the engine speed to 2300 rpm and note the exact ignition timing.Hold the engine speed at 2300 rpm, then reconnect the wiring and check that the ignition timing advances by 30°±3°from the previously noted value.

If the ignition timing only advances about20°, slacken the knock sensor securing bolt,re-tighten to 20 Nm (15 Ibf ft) and repeat the test. If there is no difference, check the associated wiring for an open-circuit, or as a last resort, renew the knock sensor.

If there is no advance in ignition timing,check the temperature sender wiring for an open-circuit. A fault is indicated in the Digifant control unit if there is no open-circuit.

May 12, 2011 | Volkswagen Jetta Cars & Trucks

2 Answers

Radiator Fan

It comes on when necessary. It is a fuel conservation technique. It could be that the sensor that runs the fan is faulty.

More info: Inthe "good old days" cars had a fan on the front of the water pump and it ran all the time --- through a belt attached to the crank shaft. It was big, heavy and largely, not necessary. It cooled the water even if the water didn't need to be cooled (winter, for example). We actually regulated the temp of the water only by the thermostat. It takes a lot of horse power to run - it is excess weight. On the other hand, it was a near bullet proof device.

Today, we use a very light fan that only comes on when the water needs more cooling than is required by the air that flows through the radiator as yo drive down the road or sit in the parking lot. It uses less power to operate, weighs less (less 'overhead' in the weight department) so it contributes little to the weight of the car compared to its utility.

If the mechanic said yo need one, you probably do.

Thanks for your interest in

Feb 20, 2010 | 1999 Jeep Grand Cherokee

1 Answer

My 97' chevy venture started with no problem in the morning and all a sudden the van just died. what went out?

It could be various problems from electrical to mechanical!
Take it to your most trusted, appropriate and economical mechanic shop for a diagnostic test (approx $50) to find the direct problem!
Hurry time is money with vehicles!
There are literally hundreds of causes of prblems with vehcles today.
I had a old mechanic tell me; "Things are made to sell today, not to use!" and I sold my new car and bought an old skool car and I am fine and can repair it in the yard.....
Good luck to you, also ask many questions to your mechanic so that you will learn also, cause "POOR ROUTINE UPKEEP" is one of the major reasons for BREAKDOWN TODAY....

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SPeedometer not working.

U need to replace the vehicle speed sensor on the transmission, it has failed this will fix all the problems. see photo of sensor.

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Sometimes car won't start

It sounds like your mechanic is right, to me it sounds like its just a dirty old starter having trouble making contact and turning... thats all. Once you replace it with a new starter that has a clean armature and new solenoid, it should start like clockwork!

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Engine starts, but won't stay started unless I step on the gas.

It sounds like to me your mechanic recommened you change your timing belt and water pump due to a maintance issue. If vehicle still runs good with old timing belt new belt wont change running. Cold weather and low cranking amps (poor battery) will cause starting problems.

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