there is a timing connector, this is usually a tan wire with a black tracer..it is usually located under the carpeting close to the heater cox on the passenger side of the truck
Distributor timing is adjusted by rotating the distributor. A scan tool is required to put the engine computer in distributor sync mode. The distributor is then set to zero degrees.
You will have to have an oBDII engine scanner and then go into the timing mode with scanner. You will then move the distributor by hand while watching scanner until it is in the specs. You can not use a timing light. The timing is controlled by the computer.If you did not have the distributor out of the engine are move it, Then there is no reason to set the timing. The computer will do it for you.
You can't, it is not adjustable, The timing is controled by the computer and there is no reason to mess with the timing. Now if you Have had the distributor out and put it back in and the engine will run and it has no check engine light on then you got lucky. Now if the light is on then you will have to get an OBD2 engine scanner and then go into the timing mode and move the distributor until you get cam and crank in time and the check engine light will go off. Tighten distributor and the computer will do the rest.
The timing on that engine is controled by the computer. You can not use a timing light. The only thing you can do is move the distributor enough to get the engine to run and have power and that is called the base timing. When it does run and the engine light is not on then you got lucky, but if the check engine light comes on, then you will have to get an engine scanner and hook it up and go into the timing mode and move the distributor until you get the cam and crank in time. The scanner will show you when it is in time and the engine light will go off. Tighten distributor and your done. The computer will do the rest.
There is no adjustment on the timing, It is controled by the computer. If you did not have the distributor out then there is no reason to worry about the timing, Unless the check engine light is on and you had it scanned with a engine scanner and it said that the timing was off. You will then need to hook scanner up to engine and go into the timing mode and move the distributor until the light goes out. Then tighten dist. and the computer will do the rest.
the wire is under the dash next to the ecm on the passenger side
you have to put the car into timing mode:-unplug the TPS-Rev up to 3k about three or four times-Put a timing light on the crank pulley and check your marks (every car is different with there timing marks)-To advance to retard timing you have to loosing the bolts on the distributor and move the distributor shaft to the proper setting to adjust timing (Car has to be running and it may run rough because the TPS is unplugged this is normal)-Then recheck timing with timing light/gun and tighten the distributor shaft.Remember - If you advance your timing to run higher octane fuel to aviod detonation.
You can't, The timing is controlled by the computer it is not adjustable. If you had the distributor out of the engine, then the only thing you can do is put it back in with the rotor pointing to the #1 pistion on the compression stroke and then move it enough to get it running. Then you will need to get a OBD2 engine scanner and go into the timing mode and set the timing with the scanner to factory specs. If you did not have the distributor out and the check engine light is not on. Then you have no problem with the timing and no need to scan the engine, the computer will take care of the timing.
Your car is in limp mode. Limp mode is a safety mode your car goes into when you have a problem so you don't blow your engine. Its usually a distributor problem a map sensor or a timing belt problem.
It all depends on what year the truck is. If it is the older version with the round distributer cap, you need a timing light. Connect the timing light to the number 1 cylinder, which is the front one on the drivers side. next you have to put the computer in base timing mode. To do this you need to locate the timing connector, which is usually located in the passenger side under the carpet ,below the hvac unit. Unplug the connector and start the engine, then shine the timing light on the timing marks and loosen the distributor and turn it unill the marks line up .Then tighten the distributor, and reconnect the connector. If it has the flat cap , the timing is set with a scanner .
You can't it is nonadjustable, The timing is controled by the computer. And there is no reason to adjust it unless you had the distributor out of the engine and in that case you will need to turn it by hand enough to get it running, and that is called the base timing. Then you will notice that the check engine light is on and you will need an OBD2 engine scanner hooked up to the truck and then go into the timing mode and ajust the timing to factory spec. and the scanner will let you know when you have the timing correct. The check engine light will go off when you have the timing right. Then the computer will do the rest.
well mine did for about 5 min NEW ANSWER; There is no timing ajustment on 99 models, It's controlled by the computor, If the check engine light is on ,then you will have to hook a engine scanner up, and then go into the timing mode and move the Distributor to specs.
When it is disconnected it puts the electronic timing control module in limp mode,and then you can set the timing with a timing light.
You can no longer use a timing light, they are a thing of the pass. You must have an OBDII engine scanner to set the timing on that year engine, because it is now electronic controlled. You will have to hook scanner up to engine and go into the TIMING MODE on the scanner and then move the distributor by hand while watching the scanner to time the engine. THERE'S NO OTHER WAY.
When you line up the 2 marks, The 1 on the timing cover and the 1 on the balancer is just a reference when you bring #1 pistion up on the compression stroke, Then you line those 2 marks up so you know it is at TDC / Top Dead Center. You can not set the timing with a timing light on a 98. It is not adjustable, It is controled by the computer. If you had the distributor out then the only thing you can do is set the base timing and you do that by ear good enough to get it running. Then you have to get a OBD2 engine scanner and hook it up and go into the timing mode and adjust the timing by moveing the distributor by hand until the scanner shows that it is within specs. Then your done and the computer will take over from there. If you are just wanting to set the timing, then there is no reason too. If the cam and crank get out of time then the check engine light will come on. And if the timing is out then the scanner will tell you.
It's a mode that tightens the timing window of notes and hammer ons.
I know that you have to put the truck in base timing mode for my 93' but I have a EST or HEI style ignition. If you have the electronic distributor then find the grey wire with a plug on the end of it next to the A/C box on the left side under the hood near the firewall. It will be hanging out of the wire harness. Apply 12 volts to it from your battery with a jumper wire and the truck will go into base timing mode. then line up the marks on your balancer. take the jumper wire out and your set.
Mode refers to the current set of functions. For example, on a digital watch, in time-setting mode, a specific button will change the hour; change the watch to stop-watch mode and that button might start the timing.
code 12 is telling you that you are in diognostic mode and the codes will start coming
This tutorial assumes that you know how to use timing light. To adjust the basic timing on any Cadillac 4.9 by rotating the distributor: 1) When the Engine is at normal operating temp, A/C off, Place Transmission in "PARK". 2) With the ignition "OFF" remove air cleaner upper housing and duct to throttle body. 3) Jumper pins A&B at the ALDL plug A/C panel should display "SET TIMING MODE". 4) Start engine, let it run at idle (less than 800 RPM) 5) Base timing should be set at 10° BTDC. If you need to adjust this, there is one 15 mm nut holding down the base of the distributor that must be loosened, it is very hard to get to without the special wrench (Kent-Moore #J29791 or Snap-On #S6134). 6) Once the timing is set, retighten the distributor hold down nut and recheck the timing. 7) Remove jumper at the ALDL plug. 8) Re-install air cleaner upper housing and duct to throttle body. All done!
The STC injector enables the engine to have two timing settings, ie advance mode when in idle and retard mode when and during appliing load.
To set the timing you must earth the ECU otherwise the ECU will be constantly changing the timing as you alter the angle of the distributor. You need to make a flat spade connector with a piece of wire and a alligator clip on the other end. On the drivers side there will be 3 spare plugs near the firewall, find the singular female spade connector and earth it by simply clipping it to the body. Earthing the ECU puts the motor into its base timing self test mode. For 30sec the motor will rev to 3000rpm then will drop back down. Then you have 3min to change the timing before the ECU kicks back in.
Start the engine and allow it to reach operating temperature. Stop the engine and connect the timing light to the No. 1 (left front) spark plug wire, at the plug or at the distributor cap. Do not pierce the plug wire insulation with HEI; it will cause a miss. The best method is an inductive pickup timing light. 2. Clean off the timing marks and mark the pulley or damper notch and timing scale with white chalk. 3. Disconnect and plug the vacuum line at the distributor on models with a carburetor. This is done to prevent any distributor vacuum advance. On fuel injected models, disengage the timing connector which comes out of the harness conduit next to the distributor, this will put the system in the bypass mode. Check the under hood emission sticker for any other hoses or wires which may need to be disconnected. 4. Start the engine and adjust the idle speed to that specified on the Underhood Emissions label. With automatic transmission, set the specified idle speed in Park. It will be too high, since it is normally (in most cases) adjusted in Drive. You can disconnect the idle solenoid, if any, to get the speed down. Otherwise, adjust the idle speed screw. The tachometer connects to the TACH terminal on the distributor and to a ground on models with a carburetor. On models with fuel injection, the tachometer connects to the TACH terminal on the ignition coil. Some tachometers must connect to the TACH terminal and to the positive battery terminal. Some tachometers won't work with HEI. WARNING Never ground the HEI TACH terminal; serious system damage will result. 5. Aim the timing light at the pointer marks. Be careful not to touch the fan, because it may appear to be standing still. If the pulley or damper notch isn't aligned with the proper timing mark (see the Underhood Emissions label), the timing will have to be adjusted. TDC or Top Dead Center corresponds to 0°B, or BTDC, or Before Top Dead Center may be shown as BEFORE. A, or ATDC, or After Top Dead Center may be shown as AFTER. 6. Loosen the distributor base clamp locknut. You can buy trick wrenches which make this task a lot easier. 7. Turn the distributor slowly to adjust the timing, holding it by the body and not the cap. Turn the distributor in the direction of rotor rotation to retard, and against the direction of rotation to advance. 8. Tighten the locknut. Check the timing again, in case the distributor moved slightly as you tightened it. 9. Reinstall the distributor vacuum line or the timing connector. Correct the idle speed. 10. Stop the engine and disconnect the timing light. jr
Yes, that is the one you unplug.
The Owners Manual sez to be in Neutral when changing from one mode to the other.