Tip & How-To about GMC Sonoma

Timing gmc, chevy, engines vortec v6 and v8 89 and up.

By distributor settings i have to assume you mean ignition timing?
How many liters? 4.3L V6 timing is set when the distributor is installed. #1 cylinder at TDC, (Top Dead Center) on the compression stroke. There is a easy trick to do this without removing valve covers to watch when both valves are closed on the number one cylinder, Remove the number one spark plug. Have a helper turn the key quickly from run to start and back to run(Make sure the distributor is unplugged and the coil wire is grounded to prevent engine starting!)while you hold your finger over the spark plug hole.(you could also use a compression gauge if you have one.)This is called tapping over the engine.You can feel the compression trying to blow your finger off the hole. Look for the timing mark on the harmonic balancer approaching the pointer on the timing chain cover. Once this is achieved, turn the key off, and rotate the engine by hand with a socket on the crankshaft pulley bolt until the tdc mark lines up with the timing mark on the timing cover. The engine is now set up at #1 tdc on the compression stroke. Look at your distributor, there are three marks on it. An indent on the bottom of driven gear, A mark in between the two shoulders just above the driven gear and when looking down at the top of the distributor a small pointer with the number 6 in it.(Disregard the one with the 8 in it as these distributors are used in the v8 as well Unless you are working on a V8!)Line up the indent with the mark between the shoulders with the rotor installed. The rotor segment should be pointing to the distributor cap hold down screw nearest the flat side of the housing. Using a long screwdriver align the oil pump drive shaft with the slot in the bottom of the driven gear. Holding the shaft in place with the housing and the two bottom marks lined up install the distributor into the engine. The shaft will turn as you engage the camshaft drive gear. With the rotor installed the rotor tip should now be pointing at the 6 mark at the top of the housing when fully seated. If the distributor will not fully seat then the oil pump shaft is not lined up. No worries though, have a helper crank the engine over a few turns, this should allow the distributor to drop in fully. Realign the mark on the balancer with the timing mark on the cover again, using the procedure mentioned above,and make sure the rotor tip points very close to the 6 mark. Rotate the housing until the 6 is dead center with the rotor metal conductor(segment). If it won't line up you installed the distributor a tooth or more off, Try the procedure again. Bolt down the distributor and you're in. If you get a check engine light afterwards and DTC(DiagnosticTrouble Code) P1345 is set off, the distributor in not installed correctly. The VCM( vehicle control module) sets the running timing based on inputs from various engine sensors so there are no other adjustments to make. Good luck stmusgrove, Let me know how it works out!
(Please Click on the yes next to was this helpful, if it was helpful. Your feedback is important. I strive to become better at helping others everyday. Without feedback this is difficult to achieve.)

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instruction for having computer set timing on 98 chevy s10 4.3 vortec v6


the computer can not set the timing if the distributor is off or if the timing chain off

Nov 01, 2012 | Cars & Trucks

2 Answers

when setting the ignition timing on a 1991 ford ranger 3.0 were dose the rotor need to point, after number one or before number one? the engine is on top dead center


The engine timing markers down on the harmonic balancer/crankshaft pulley should be aligned with the timing indicator on the engine block to "0" degrees when the engine is in the compression stroke for the #1 cylinder, and this is TDC or "Top Dead Center". When something blows out of the spark plug hole that only means that the piston is coming up on TDC, but the crankshaft will still have to be turned until the timing markers are at "0" degrees. You should be sure that you do know how to properly align the timing marks to "0" degrees, and the timing marks must be set at "0" degrees before the distributor can successfully be installed.

Be certain that the timing marks are set at "0" degrees and on the compression stroke for the #1 cylinder, or the timing will be 180 degrees off when you install the distributor. This has to be precise and guessing will not get the distributor properly clocked in so that the ignition timing can be correctly set.

Once you are certain that the timing is set to "0" degrees "TDC", then mark the distributor housing where the #1 position on the distributor cap will be when the cap is installed on the distributor, so that the distributor housing shows a reference mark where the #1 position is, then the distributor should be installed so that the ignition rotor is pointing directly at the #1 position on the distributor housing, or just before the #1 position mark according to the rotation of the ignition rotor. The distributor should be able to turn and point the ignition rotor on either side of the #1 position mark to provide plenty of timing advance or ****** so that the ignition timing can properly be adjusted to specifications after the engine has been started.

Be sure that you follow the proper timing procedure for that vehicle and remove any timing spout connectors that are described in the set timing procedures

Also, be certain that you are actually using the #1 cylinder to set the engine to TDC and to actually time the engine with a timing light. Here is a firing order diagram that should also help to assist you. Let me know if you require any further assistance.






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Jun 17, 2010 | Ford Ranger Cars & Trucks

3 Answers

i need a fire timing order for a chevy astro van v6


THE FIRING ORDER IS AS FOLLOWS : 1-6-5-4-3-2.
CYLINDER NUMBERS (front-to-rear) :
LEFT (driver side) 1-3-5
RIGHT (passenger side) 2-4-6

To set ignition timing, ensure that engine is at operating temperature, (190 degrees or above), bypass EST (electronic spark timing) by unplugging the single tan wire with a black stripe from the distributor. Ignition timing should be set at 0 degrees or TDC (top dead center). If not, loosen distributor hold down bolt and adjust, then retighten.

Mar 05, 2010 | 1993 Chevrolet Astro

1 Answer

timing on a 1990 Wrangler with a 4.2 liter


4.2L 6-Cylinder

1. Set parking brake. Shift automatic transmission to Park or manual transmission to Neutral. With A/C off, start engine and attain normal operating temperature.

2. With ignition OFF, connect an ignition timing light and a calibrated, expanded-scale tachometer.

3. Disconnect 4 " and 10 " Hg (CEC System) vacuum switch assembly wire connector (located at top of valve cover). Disconnect and plug distributor vacuum advance hose.

4. Start engine, increase engine speed to 1600 RPM and check ignition timing. Adjust timing to specification listed on Emission Control Information label (if necessary). Tighten distributor hold-down clamp and recheck ignition timing.

5. Turn engine off and remove timing light and tachometer. Connect No. 1 spark plug lead, if disconnected. Unplug and connect distributor vacuum advance hose. Connect vacuum switch assembly wire connector.

NOTE: If timing light has an adjustable advance control feature, turn control to OFF position.

Timing is set per the emissions tag under hood.

Jan 16, 2010 | 1990 Jeep Wrangler

1 Answer

WHAT IS THE DISTRIBUTOR SETTINGS ON AN 97 GMC SONOMA


By distributor settings i have to assume you mean ignition timing? Please send me a message with the engine size.rulrich071870@yahoo.com. How many liters? 4.3L V6 timing is set when the distributor is installed. #1 cylinder at TDC, (Top Dead Center) on the compression stroke. There is a easy trick to do this without removing valve covers to watch when both valves are closed on the number one cylinder, Remove the number one spark plug. Have a helper turn the key quickly from run to start and back to run(Make sure the distributor is unplugged and the coil wire is grounded to prevent engine starting!) while you hold your finger over the spark plug hole.(you could also use a compression gauge if you have one.)This is called tapping over the engine.You can feel the compression trying to blow your finger off the hole. Look for the timing mark on the harmonic balancer approaching the pointer on the timing chain cover. Once this is achieved, turn the key off, and rotate the engine by hand with a socket on the crankshaft pulley bolt until the tdc mark lines up with the timing mark on the timing cover. The engine is now set up at #1 tdc on the compression stroke. Look at your distributor, there are three marks on it. An indent on the bottom of driven gear, A mark in between the two shoulders just above the driven gear and when looking down at the top of the distributor a small pointer with the number 6 in it.(Disregard the one with the 8 in it as these distributors are used in the v8 as well.) Line up the indent with the mark between the shoulders with the rotor installed. The rotor segment should be pointing to the distributor cap hold down screw nearest the flat side of the housing. Using a long screwdriver align the oil pump drive shaft with the slot in the bottom of the driven gear. Holding the shaft in place with the housing and the two bottom marks lined up install the distributor into the engine. The shaft will turn as you engage the camshaft drive gear. With the rotor installed the rotor tip should now be pointing at the 6 mark at the top of the housing when fully seated. If the distributor will not fully seat then the oil pump shaft is not lined up. No worries though, have a helper crank the engine over a few turns, this should allow the distributor to drop in fully. Realign the mark on the balancer with the timing mark on the cover again, using the procedure mentioned above, and make sure the rotor tip points very close to the 6 mark. Rotate the housing until the 6 is dead center with the rotor metal conductor (segment). If it won't line up you installed the distributor a tooth or more off, Try the procedure again. Bolt down the distributor and you're in. If you get a check engine light afterwards and DTC(Diagnostic Trouble Code) P1345 is set off, the distributor in not installed corectly. The VCM( vechile control module) sets the running timing based on inputs from various engine sensors so there are no other adjustments to make. Good luck stmusgrove, Let me know how it works out!
(Please Click on the yes next to was this helpful, if it was helpful. Your feedback is important. I strive to become better at helping others everyday. Without feedback this is difficult to achieve.)

Dec 27, 2009 | 1997 GMC Sonoma

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