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300 inline six cylinder not firing where do I start to solve problem

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Posted on Jan 02, 2017

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SOURCE: 1966 ford f100 inline 6 cyl 300\r\engine turns

Make sure that the primary wire between the distributor ignition points and ignition coil is not damaged anywhere and grounding the circuit out. This is not a ground wire.

Replace the ignition points condenser, if this is shorted your points will never be able to work. With the condenser removed, use an ohm meter to check the resistance between the end of the condenser wire and the condenser caseing, there should be infinite resistance or an open loop, but it should not show any kind of a connection between the two, or it is grounded or "shorted to ground" and it will prevent the ignition system from working.

Are the ignition points adjusted properly? They have to open and close to send a dwell signal to the coil.

Connect a test light to ground and on the NEG. (-) side of the coil, have someone crank the engine and look for the test light to flash, the test light should flash indicating a dwell signal or coil pulse. (Do not use the POS. + side of the coil for this test, because you will not get a dwell signal).

If no dwell signal, then...

1. Turn off ignition and remove the distributor cap and turn the engine over until a high spot on the distributor cam lobe is on the rubbing block on the ignition points.

This is the fully open position for the ignition points and where they need to be to set them. and if you do not know the feeler gauge size, or the dwell angle to set your points at (according to manufacturers specifications), then tear off a piece of a match book and place it between the two point breakers.

2. Loosen the point hold down adjusting screw and move the base of the points with a screwdriver (look for adjusting nothches), until there is a light drag felt pulling on the match book. For the newer GM's up to 1974, just use a 1/8 allen wrench to obtain the same light drag on the match book.

3. Remove the matchbook and there should still be a small gap between the point breakers, rotate the engine and you should see the points open and fully close.

4. Pull the coil wire out of the distributor cap and ground the end of the coil wire well or you might get shocked.

5. Have someone crank the engine and re-check for a dwell signal, you should also see a blue-white spark flashing between the point breakers as they open and close.

If you now have a dwell signal then replace the distributor cap back onto the distributor and the the coil wire back onto the distributor cap, the engine should now start.

If you did not grease the rubbing block of the ignition points with die-electric grease when you installed them, then the rubbing block on the points will wear down prematurely, the points will close down, and the engine will no longer start.

If you crank your engine over and the ignition rotor turns clockwise (looking down at the rotor) then you need to put the die-electric grease along the right side of the rubbing block edge (looking down at the points) so that the grease is trapped between the points and the distributor cam lobe, and the distributor cam lobe can pick up the grease. (Grease the left side of the rubbing block edge if the ignition rotor turns counter-clockwise). Only use die-electric grease.

Posted on Apr 19, 2010

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1 Answer

Engine firing order


First generation (ZJ) (1993-1998) what engine?
you dont know what engine is under the hood>?
well there are 3+ engines. or more , if exported out of USA. more.
for the inline engines, all are #1 front (RWD cars)
if you look close,. one cylinder is more forward that the other in front
that farther forward is called #1 on all V engines. (ASE class day 1 rule)
now the firing orders of most.
1,3,4,2 I4.
153624 v , I6 <<<<<< my guess. INLINE SIX Four Liters?
5.9l started in 1998 , USA Export models produced at the plant in Graz, Austria, were given the vehicle designation of "ZG". (have diffr. engines)


3.7L 6 cylinder
1-6-5-4-3-2

4.7L 8 Cylinder
1-8-4-3-6-5-7-2

5.7L 8 Cylinder
1-8-4-3-6-5-7-2

even the 5.9L fits. some jeeps had the engine changed.
so not looking and seeing what you have its a wild card.
mine has 3.8L V6
1-2-3-4-5-6.
but fires in pairs, due to wasted spark coils ,(3 coils) tricky , no?

now I have answered for just about all engines. there.

Mar 18, 2014 | 1999 Jeep Grand Cherokee

1 Answer

My ford f 150 with a 300 inline six is idling rough but with run, runs good at high rpm but is running rich


I have a 1967 Ford F1oo with the in-line 300 6 cylinder that's running rough what could possibly be the problem The gentleman that I bought the truck from said it would be a burnt valve

Oct 21, 2012 | Cars & Trucks

1 Answer

What is the sparkplug gap for the 2002 jeep grand cherokee inline six cylinder


on four cylinders and inline sixes the gap is .035 as reccomended. but if the plugs are platinim, do not try to reset for they are set at factory. have a good day !!

Jan 08, 2011 | 2002 Jeep Grand Cherokee

1 Answer

A miss in the firing order I need a digoram of the firing order


FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement. If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired. Fig. 1: 300 cid (4.9L) inline six-cylinder engines Firing order: 1-5-3-6-2-4 Distributor rotation: Clockwise 85762008.gif
Fig. 2: 232 cid (3.8L) V6 engine Firing order: 1-4-2-5-3-6 Distributor rotation: Counterclockwise 85762006.gif
Fig. 3: 255 cid (4.2L), 302 cid (5.0L), 360 cid (5.9L), 390 cid (6.5L), 460 cid (7.5L) V8 engines Firing order: 1-5-4-2-6-3-7-8 Distributor rotation: Counterclockwise 85762007.gif
Fig. 4: 351 cid W & M (5.8L), 400 (6.6L) engines Firing order: 1-3-7-2-6-5-4-8 Distributor rotation: Counterclockwise 85762009.gif
Fig. 5: 6.9L diesel engines Firing order: 1-2-7-3-4-5-6-8 85762010.gif
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Jul 17, 2010 | 1982 Ford F 150

2 Answers

I mixed up my firing order on my ford F-150 300 engine i need the correct firing order.


For the Ford 300 inline 6 cylinder the firing order is: 1-5-3-6-2-4

Hope this helps

Jun 26, 2010 | Cars & Trucks

1 Answer

2005 Chrysler 300 3.5L engine #6 cylinder location


It appears that your number six cylinder is right rear, chrysler 300, 3.5 lt, firing order 123456.

Feb 12, 2010 | 2005 Chrysler 300

1 Answer

Need firing order diagram 1985 F150 inline six


Easyer to explain then it is to get a diagram. Standing facing your truck cylinders are numbered 1 to 6. The front most cylinder being one and the back one closest to the cab is 6. The blackened terminal on the distributor cap indicates the number one spark plug wire position. In clockwise order from the blackened terminal firing order is 1-5-3-6-2-4.

Dec 22, 2009 | 1985 Ford F150

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