Question about 1989 Chevrolet C1500

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Where should my rotor bug be pointing to when num 1 is at tdc on a 5.7 TBI in a 1989 1500 4x4 chevy

Just put a 30 over lower end old school block under vortec heads and TBI but runs like its out of time

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Make sure the rotor button is pointing at the number one spark plug that would be the first plug you see to your left facing the engine from the front of the vehicle looking towards the rear.

Posted on Dec 11, 2014

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The rotor button should be pointed at the number one cylinder on the contact of the distributor cap. Be careful because on some of the GM distributor caps can be a little confusing. The contacts on the inside of the distributor cap can sometimes be a little confusing. Also on another note, those 5.7 vortec heads on a older 5.7 TBI block will make a very noticeable difference. Make sure and check the exhaust and intake ports and see if they are the same size. Some vortec heads have what they call a "Cathedral port". Lastly if you are kinda handy around a shop you can port and polish the inside of the cylinder head yourself. The main thing is to get all of the rough casting burs off the inside of the ports. I have used a flex head dremel tool and sanded them smooth. You will not believe the increase in torque, horsepower, and throttle response. Good luck.

Posted on Dec 11, 2014

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I have a 1993 gmc 1500 350 tbi engine.I need to no if the rotor on the disturber points to the no.1 cylinder or the no.1 on the disturber cap when installing the disturber.please help

Your supposed to make a mark all that before you pull the distributor. Did you mark the relationship between distributor body and engine? Then you note where the rotor is pointing, make a scratch mark. When you reinstall the distributor, line up all the marks.

If engine was turned with distributor out, You need to put the #1 piston on tdc of compression stroke. Stab the distributor, which ever spark plug tower the rotor is pointing at/turning into, becomes number 1. Then you follow the firing order around the cap in clockwise direction.


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How to reset timing on 1992 454 tbi after replacing distributer

You have to put the number 1 cylinder at Top Dead Center of the compression stroke, and then you install the distributor with the rotor pointing to the #1 spark plug wire tower that is on the distributor cap.

Pull the spark plug from number 1 cylinder. You need a helper to turn the engine over by hand (using a socket on the crank pulley), or he can bump the starter over in very short bursts. Put your finger over the spark plug hole. When the piston is rising on the compression stroke, you will feel air pressure on your finger. Now look at the crank pulley and turn the engine on over until the zero degrees mark lines up on the timing pointer. Or you can stick a long straw or similar into the spark plug hole (don't let it drop into the cylinder!) to feel when the piston is at top of travel...see, you feel for pressure build up with finger (piston is rising on compression stroke), when you feel it, turn engine on over by hand until the piston is at top of travel-that is TDC of compression stroke. Now install distributor so that rotor ends up pointing directly to number 1 spark plug wire tower. Then follow firing order -as the rotor turns, it will follow the firing order around the dist. cap.
There are two top dead centers of each piston, tdc of compression stroke and tdc of exhaust stroke- to time the engine, you need tdc of compression-that is when the spark plug fires in the cylinder, so that is when you want the distributor in with the rotor pointing to #1.

Jul 28, 2014 | 1992 Chevrolet C/K 3500

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1988 chevy S10 2.5L tbi

out of time. get piston num. 1 to top dead center on compression stroke then make your rotor on dist. point to #1 and it should fire up. you may have to then turn the dist. some to get in in specs.

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Don't worry about actually pointing toward # 1 cylinder, just the tab under cap that goes to # 1 spark plug wire. # 1 cylinder needs to be at TDC on compression stroke, and rotor pointing at # 1 wire tab under cap.

Jan 15, 2014 | Dodge Ram 1500 Cars & Trucks

1 Answer

Have 1988 tbi chevy 350 pulled the distributor out only to find out the marks are gone, now what?

Retime it. Put #1 cylinder at TDC of compression stroke. Pull number one spark plug: with finger over hole turn the crank with a socket and feel for the pressure buildup as engine turns. When you feel pressure, that means number one piston is rising on it's compression stroke. Now turn the crank on around until it is lining up the zero mark on the pointer scale. TDC of compression stroke.
Now put the distributor in so that the rotor when installed is pointing to the number one spark plug tower. Distributor shaft will turn slightly as it is installed, so start with shaft and rotor turned a bit back, so when slides into position, rotor is pointing directly to #1 plug tower. Keep playing with it until you get it right.
Good luck.

Aug 28, 2013 | 1988 Pontiac Firebird

1 Answer

Need a diagram on how to put wires on a distributor for a 78 monte carlo motor wit a 305

The fireing order is 1 8 4 3 6 5 7 2 . Pull #1 plug bring engine up on' top
dead center if you put a finger in the plug hole you will hear and feel the engine coming up on compression and TDC, Pull dist cap and locate # 1 terrminal the rotor will be pointing at the location .Rotation on small block chevy's is clockwise start with #1 and plug the wires in. Hope this helps

Mar 14, 2013 | Chevrolet Monte Carlo Cars & Trucks

1 Answer

I am having problemsseting the distributor on a 1996 chevy 305. this is a new motor . do i set the pointer at # 6 or # 1

The distributor rotor must point to the post on the cap of the cylinder that is firing. In your case, if #6 is at TDC of the compression stroke, than the pointer must point to the distributor cap post of the #6 cylinder wire. But I must tell you that if you have TDC on #1, and rotate the crankshaft 360 degrees, #1 will be at TDC again...

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1 Answer

Regaurding firing order on 1993 chevy G20 350 small block is 1 8 4 3 6 5 7 2 but WHERE does number 1 START? ... clock wise I was told and there is a manifacture raised line between two posts IS THAT WHERE...

Yeah, likely that raised line is your starting point. #1. Try lining up your crankshaft pointer(turn with a socket wrench on crank pulley) to 0 degrees. If you are on compression stroke on cyl. 1, your rotor will be pointing to no. 1 plug tower. If you are on exhaust stroke of no. 1 cyl., then your rotor will be exactly 180 degrees off. If you are confused, just turn your crank clockwise one turn (360), and line up zero again. Now your rotor will be (again) either pointing to No.1 position, or 180 degrees off (pointing in opposite direction)One of those positions should line up with that manuf. mark. (Here is easiest way to find TDC of #1 cyl. on compression stroke: pull #1 plug out. Hold finger or thumb over hole, while turning crank, when you feel pressure building on cyl, you are approaching TDC of compression stroke. Just turn crank (clockwise) till pointer is on zero. Done!) Now your rotor will definitely be pointing to #1 plug on your dist. cap.

Oct 30, 2011 | 1993 Chevrolet K1500

2 Answers

Nissan ca20e distributor replacement. rotor position for TDC when replacing DizzyI have removed old dizzy with out looking or marking. thank you

Here's about the best way to do it, if you left off the dizzy marking. Take the spark plugs out, and put your finger OVER, NOT IN, spark plug hole #1. When you feel the compression bump your finger off the hole, stop right there. Align the cap so that Cylinder #1 is just being fired/a little after being fired (The rotor bug is pointing to #1). Start it up, and tune it from there.

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