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54 Cadillac 341 motor with a pertronix ignition. intermittent spark on #7 cylinder. changed distributor twice, wires twice rotor once. any ideas on why the misfire on #7 ???

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You didn't say if you had tried a different spark plug. If you sure it's not the plug, then maybe something wrong mechanically in that cylinder- like a sticking valve that stays open and won't build compression. That will cause a misfire. Do a compression test and see if that cylinder is equal to the others.

Posted on Apr 26, 2017


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Missing problem

Missing problem requires to check the following systems and components:
1. Fuel system. (Fuel pump, fuel filter, fuel injectors).
2. Ignition system. (Spark plugs, spark plug cords or wires, ignition coil, distributor (cars with distributor type ignition system, rotor, distributor cap, ignition amplifier), Coils On Plugs (COP) and correct sequence of the spark plug wires and or Igniter connectors.
3. Air leakage in the intake manifold.
4. Detached vacuum hose.
5. PCV Valve.
6. Servo brake booster pipe or diaphragm.
7. Valve clearance.
8. Cylinder compression.
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10 . ECM.

Oct 06, 2013 | Toyota Corolla Cars & Trucks

1 Answer

I have a 98 honda accord 5 spd it has a 4cyl motor vtech i just need to know how to fix a miss fire in cylinder 2 and wich one is cylinder 2

Cylinder #2 is the the second spark plug counting from the right to left.
EX.Below are spark plug on engine
' (oil cap) '
' (4) (3) (2) (1) '

Your misfire can be cause by couple of things but the cheapest way that you can try to fix your car is to do a tune up by replacing:
1)all spark plugs
2)do a oil change
3)spark plug wires
3)distributor cap and rotor

note misfire can be cause by:
1.bad gas
2.spark plug and/or wire
3.distributor cap and/or rotor
4.valve adjustment
5.injector timing
8.bad wiring(power, ground or feed line)

Jul 08, 2011 | 1998 Honda Accord

2 Answers

I have a 1993 Geo Prizm LSI, that cranks, but will not start, and has no spark. The problem began as a cold engine hard starting problem, but after I replaced the distributor with a rebuild, it stopped...

Are you sure you got the dustributor in the right tooth? Check timing using procedure at link below. Or, maybe you got a bad rebuilt. Here are some tests to check it out:
See Figures 6 and 7
  1. Check for spark at each spark plug with a spark tester. Check at least 2 plug wires.
  2. If spark is only detected at some plugs, check for a faulty distributor cap or rotor. Also check the spark plugs and plug wires. Replace, if necessary.
  3. Measure the resistance of the distributor connector C1 when cold, between terminals 3 and 6, using a digital voltmeter. If the camshaft position (CMP) sensor resistance is not between 185-275 ohms, replace the distributor housing.
  4. Measure the resistance of the distributor connector C1 when cold, between terminals 2 and 5, using a digital voltmeter. If the camshaft position (CMP) sensor resistance is not between 370-550 ohms, replace the distributor housing.
  5. Measure the resistance of the distributor connector C1 when hot, between terminals 3 and 6, using a digital voltmeter. If the camshaft position (CMP) sensor resistance is not between 240-325 ohms, replace the distributor housing.
  6. Measure the resistance of the distributor connector C1 when hot, between terminals 2 and 5, using a digital voltmeter. If the camshaft position (CMP) sensor resistance is not between 475-650 ohms, replace the distributor housing.
  7. Measure the air gap between the signal rotor and the camshaft position (CMP) sensor. If the air gap is not 0.008-0.016 inch (0.2-0.4 mm), replace the distributor housing.

Fig 6
Fig 7
Repair Guides Ignition Timing Checking And Adjustment AutoZone com

Sep 07, 2017 | 1995 Geo Prizm

1 Answer

My 98 exployer is misfiring on all 6 cycdeers but runs fine after warmed up

Misfires across all 6 cylinders could indicate the following:

Priority Action Part Type Cause 1 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s). 2 Inspect Distributor Cap Loose, Burned or Cracked Distributor Cap. 3 Inspect Distributor Cap and Rotor Kit Loose, Burned or Cracked Distributor Cap and Rotor. 6 Inspect Spark Plug Fouled, Damaged, Broken, or Incorrectly Gapped Spark Plug(s). 7 Inspect Coil - Ignition Faulty Ignition Coil. 8 Inspect Condenser-Ignition Faulty Condenser-Ignition. 9 Inspect Point Set Burned, Worn or Incorrectly Set Ignition Points. 15 Inspect Timing Specification Incorrect Ignition Timing. 19 Inspect Fuel Injector Dirty or Worn Fuel Injectors. 21 Inspect Intake Manifold Gasket Leaking, Worn, or Damaged Intake Manifold Gasket. 22 Inspect Distributor Worn, Damaged or Faulty Distributor. 24 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.

Nov 03, 2010 | 1998 Ford Explorer

1 Answer

Chevy 95 g20 van 8 cylinder wiring order spark plugs

1-8-4-3-6-5-7-2 The #1 spark plug is the front spark plug on the drivers side and the cylinder location in order from front to back on the drivers side is 1-3-5-7 and on the passenger side it is 2-4-6-8. The ignition rotor rotation is clockwise.

If your Distributor cap is not numbered then replace the new wires, or transfer the old ones to the new distributor cap one wire at a time. Identify the #1 spark plug wire and start from there.

Apr 23, 2010 | 1995 Chevrolet G20

1 Answer

Chevy k1500 5.7 v8 wont start

Sounds like your timing is off when you placed the distributor back in or your spark plug wires are crossed. Start with the simple and check the spark plug wire firing order. 1-8-4-3-6-5-7-2 Cylinder numbers drivers side 1-3-5-7 radiator to firewall. Cylinder numbers passenger side 2-4-6-8 radiator to firewall. Distributor cap #1 is at 5 O'clock and rotates clock wise. Once that is establish to be good then make sure the cylinder 1 is at TDC with the distributor rotor at the #1 position. Good luck and hope it's a crossed firing order.

Jan 11, 2010 | 1994 Chevrolet K1500

1 Answer

Change plugs and wire and engine will not acclerate. This is a built 350 short block chevy with pro charger.

350 Chevy engine in what? 1990 Corvette? Who built it, did you?

Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;

Spark plug wire connection towards the Front of the engine;

(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.

Oct 13, 2009 | 1990 Chevrolet Corvette

2 Answers

Ford engine doesn't start after self tune up

Ok here is the meaning of firing order The numbers 1-5-4-2-6-3-7-8 represent the order of wish cylinder the distributor send a spark as it rotates Starting whit cylinder number 1 The distributor will have to rotor on the number 1 cylinder spark plug and the piston on the number 1 cylinder will be at the top So the fuel and air will be compressed and ignited by the spark plug. The next one will be the cylinder number 5 to do the same as the crankshaft and distributor rotate Next will be number 4 then 2 then 6 ? 7 ? 8. You get the idea "10 Degrees" The degrees represent of spark advance You may think gas explode instantly but it actually take a little time So for the explosion has maximum power when the piston reaches the top of the cylinder the distributor send the spark a little ahead of time 10 degrees of revolution is the recommended by the manufacture but that can be adjust buy losing up the distributor clap bolt and manually turn it. In order to adjust that you need a timing gun Than will flash light on the crankshaft pulley (harmonic balancer) and you will see a notch and a series of numbers than represents the timing advance Note If you have not turn the distributor by loosing to button clap bolt I recommend to live it alone and go to you local part store and get the repair manual find the firing order to see wish wire go to wish cylinder Rotate the crack shaft pulley on till the notch is on 0 and see if the distributor rotor is tours cylinder number one. Cars than don?t used distributor do that automatically and constantly adjust the ignition timing by the computer.

Jun 08, 2009 | 1993 Ford Ranger SuperCab

1 Answer

Ignition Wiring


To my knowledge, firing order is 1-8-4-3-6-5-7-2 clockwise on the distributor cap with the Number 1 post pointed towards the Number 1 cylinder. The cylinders are numbered 1-3-5-7 (front towards the back) driver side while the passenger side/bank are numbered 2-4-6-8 (likewise front to back).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jun 04, 2008 | 1993 Chevrolet K1500

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