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My distributor has a strong spark but there is hardly a spark or weak spark going to my spark plugs and i just replaced my dstributor rotor button and crank sensor

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Try replacing the spark plugs and wires. You may be have high resistance within the wires causing a weak spark on the other end. Also try regapping the plugs. If the gap is too large the spark will need to be more powerful to jump the gap. If its too large you wil also get reduced performance and fuel economy and possibly rough idling...

Posted on Sep 30, 2009

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Ignition mystery! 1994 GMC Suburban 2500 5.7 mtr. No spark to spark plugs. Have spark from coil to distributor. Have changed coil wire, cap, rotor, ignition module, and coil. have 12.5 volts going to...


I guess you could have the ignition analyzed on an oscilloscope. Maybe a tech could see something then.
I always heard the only gap was the spark plug gap-the rotor has no gap-are you sure you got the correct rotor? And does it touch the top distributor cap coil wire tower?

Let us know. It is a mystery worthy of a solution.

Sep 21, 2013 | Chevrolet Suburban 2500 Cars & Trucks

1 Answer

What would make itspitback though carb after tuneup?


recheck the spark plug wires/firing order, sounds like you got wires crossed or as other asked what did tuneup consist of was cap and rotor replaced?, or if no dstributor, (and if has coil pack,,and no distributor then as stated wires may be crossed) if has distributor, posssibly rotor on backwards. what kind of veh, engine size.

Sep 10, 2012 | 1986 Chevrolet Chevy

1 Answer

My 98 tacoma has a skip to it i changed the plugs in wires still doing it


if its a cap and rotor distributor replace them. If its coil packs then you could also pull your spark plug wires (mark where they go), place a spark plug in one, ground it on the valve cover or intake manifold by the threads of the plug and have a friend turn the car over. Blue spark is strong, orange is weak. Dont hurt yourself.

Jul 23, 2012 | Cars & Trucks

1 Answer

I get spark comming in to the distributer but not comming out whats do i do to fix this


The distributor cap may be faulty, it could be cracked or the spark is arcing to ground, or the rotor button is faulty. Also check the spark plug leads from the distributor to the spark plugs.
If the distributor is faulty (ie cracked or there is a carbon track on the inside of the distributor cap) then replace the distributor.
If the rotor button is faulty, then replace the rotor button.

Jan 20, 2012 | 1996 Volkswagen Jetta

1 Answer

My 1990 sierra has a miss in it when i accelarate. I replaced plugs and wires but not the fuel filter or fuel pump.I also smell fuel outside between the bed and cab on the drivers side


Check out the distributor cap and rotor arm, - and make sure the plugs ar gapped properly - should be 1mm on 1.6 1.8, and 0.75mm on the 2 liter.
Check the oil level urgently, if it has been misfiring for some time you will have acuumulated all that unburnt petrol in the oil sump!!! (you can test this by getting a bit of oil from the dipstick and putting a drop on your fingers, rub together and sniff the oil, if it stinks of petrol change it -you need to change the oil filter too since it wil be full of petrol tainted oil also.
Once you are sure you have good oil and either it was ok after testing it from the distick "golden, clean oil" or you replaced the contaminated oil and filter you can move on to sorting out this misfire.
- You didn't mention if you checked or replaced the HT coil - Check for strong sparking from the main HT lead from the coil itslelf, Pull the lead from the centre of the distibutor cap - have someone crank the engine while there is a "spare" sparkplug in the main ht lead (ground the plug to the engine, holding the rubber insulation of the cable with pliers - Use a normal HT lead if the main coil lead wont reach a suitable grounding point with the sparkplug) - check for solid bright blue spark, it should be regular timed, and strong EVERY time - any missing or weak sparks indicate electrical problem either - the coil is failing - or the battery is weak - or the distributor is faulty. - a faulty distributor would be expensive to replace and more so to repair, a reconditioned distributor costs around £120.
for now I assume the coil checked out fine and gave a strong steady uniform set of sparks. ----------------------- With a fully functioning coil, you're left with the distributor cap and rotor arm - the distributor cap comes off with 2 screws at the left and right sides of the cap between the HT Connectors - unscrew them - (note the original orientation of the distributor cap before you pull it off to aid refitting) you can now pull away the cap from the rest of the distributor.
INSIDE the CAP there are four "poles" round the outside, and a spring mounted contact in the center - make sure the poles are clean and shiny with only light markings at most, if they are blackened, whitened ro rounded and pitted then replace the cap - ford dealers or local part shop, most shops will stock both the rotor arm and distributor cap for around £15-30 - phone around for the best deal.
Still on the distributor is the rotor arm, this pulls off - it has to be pulled dead straight off the distributor shaft - once you have the rotor arm off you can inspect the metal contact on the top for general dirtiness and decay, it "should" be shiny brass/copper in colour. if it looks pretty bad, pitted or blackened/burned- - get a new rotor arm from ford dealers or from local part shop (not expensive)
Once you are sure of a clean or new rotor arm and distributor cap you can try the engine again - hopefully the misfire is gone.
If it is still there....
we are here

DISTRIBUTOR CAP - FINE ROTOR ARM - FINE OIL + FILTER NOT OVER LEVEL + CLEAN, NO PETROL IN IT HT COIL - GOOD STRONG REGULAR SPARK. -----

If it still misfires with all these things in perfect order then you are left with: Clogged Fuel Line/Filter or Failing Fuel Pump or Ignition TIMING - ( 10-12 degrees BTDC) have igition timing checked and set if not correct. OR... Faulty Distributor - pretty much worst case scenario. Tell me how you get on - Often it is the distributor cap and rotor arm - If not I hope its the fuel filter!
Good luck,

Jan 22, 2010 | 1990 GMC Sierra

1 Answer

Turns over but won't start


pull out one of the spark plugs plug it in to plug wire run a jumper wire to the body or hook of the plug to ground the jumper must go to a suitable ground. pull out pcv hose to prevent car from starting have an assistant turn over the engine while you check for a strong blue or purple spark if the spark looks white or yellow there is a weak ignition condition and this must be adressed, bad ignition module bad cap and wires, etc. do the cap and rotor first if the spark is weak. If there is a strong spark sometimes holding the gas pedal to the floor while turning over the car for no more than 10 seconds starts stubborn motors do not let up on gas if car begins to start not until the motor starts to rev up.

Jul 20, 2009 | 1993 Dodge Shadow

3 Answers

Spark from coil but not from plugs


Hello;
Take the distributor cap off, and turn the engine over. Does the rotor turn? Then pull the #1 spark plug and with your finger over the spark plug hole , tap the engine over to top dead center. See where the rotor is pointing. Also check to ensure your points are opening and closing. With an ohm meter make sure you have continuity through the carbon for the coil in the cap. Hope it helps.
Thanks;
Rich
RPM Northwest

Mar 31, 2009 | Volvo 240 Cars & Trucks

2 Answers

Mazda rustler 160i


Hi Gerrie1974-

WildBill49 here......Not knowing the specific year and version of your Mazda, I cannot give you a specific part at fault, but I can help you. I am assuming we're talking about an electronic distributor single coil ignition system

If the spark is weak directly out of the coil (with a known good coil hooked up with correect polarity), then the problem is in the spark trigger module... There is a variety of designs, but the basic components remain the same. This is the part of the ignition system that replaces the breaker points. It consists of two parts - a magnetic spark trigger sensor, and a spark signal amplifier/controller. these are sometimes combined into one ignition module.

Replace this module, and spark from the coil should be strong! If it is still weak, reverse the two wires to the coil.

Weak spark at the plug wire with the above good indicates distributor cap/rotor replacement time...

Gerrie, I hope this is what you are looking for, best of luck, and if you feel my advice worthy, please rate it!!!

Thanx-
-WB

Jun 22, 2008 | Mazda 323 Cars & Trucks

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