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Will bad spark plugs cause engine backfire through the intake manifold

Back fire through thr intake manifold

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 2000 DODGE STRATUS 2.5 V6

There may be a ground wire that you forgot to put back or a power wire that give power to the coils. Re-check all electrical wiring and make sure they are all connected. Good luck and thanks for using FIX YA

Posted on Mar 21, 2009

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SOURCE: 2002 Mitsubishi Galant gets poor acceleration.

LOOK AROUND THE AIR INTAKE HOSE.MAKE SURE IT IS INTACT NOT LOOSE.CHECK ALL VACUUM HOSES ON INTAKE.MAKE SURE THEY ARE IN PLACE.

Posted on Aug 17, 2009

thunderalley
  • 432 Answers

SOURCE: Intake manifold cracked and leacking coolant (External)

You can clean the area really good with degreaser and apply JB Weld but that is only a temporary fix it will leak again

Posted on Oct 04, 2009

rtpflh
  • 546 Answers

SOURCE: I changed spark plugs 04 Hyundai Santa fe

Check vacuum and/or electrical connections at the fuel pressure regulator,usually located on the fuel rail near the line from the gas tank. It sounds like your regulator is being held 'wide open' by too much vacuum or no signal from ECU.

Posted on Nov 19, 2009

  • 244 Answers

SOURCE: i have a 2004 Hyundai Santa Fe with the 6 cyl.

don't take the manifold off....... see if perhaps the window wiper dip tray will be enough room to access the rear plugs.....do not remove intake.

Posted on Apr 27, 2010

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1 Answer

Where is and what firing order of spark plugs for 2008 ford f150 4.0l v6


Firing order can be obtained at any parts store, online or at a dealer. Misfiring can be a bad spark plug, a bad spark plug wire. Bad news is a bad value seat (most likely intake) or the fuel injector may be the issue.

Apr 02, 2017 | Ford Cars & Trucks

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What could cause a loud snapping noise in the area of the air intake


Your car is backfiring into the intake. Will make sound your describing.

Jan 02, 2016 | 2004 Jeep Liberty

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4.5 cadillac engine sputters and back fire




  • Backfiring in internal combustion engines occur outside of the combustion chamber, and are typically the result of an improper air to fuel ratio. This can be caused by a vacuum leak, Idle air control valve, throttle position sensor, oxygen sensor, or just about any part of your emissions contorl system.


  • Backfires may also occur before the combustion chamber. One possible cause of this is igniton timing. If the timing is too advanced, the spark plug fires before the intake valves close, causing the combustion to propagate into the intake manifold, further igniting the air-fuel mixture there; the resulting explosion then travels out of the carburetor or intake and air filter. Alternatively, the engine timing may be retarded, in which case the combustion is not completed by the time the exhaust valves open, allowing the combustion to propagate into the exhaust system.


  • Improper wiring of the ignition can also lead to timing issues and backfires, or faulty coil or igniton modules.


  • Low fuel pressure, clogged fuel filters, and weak fuel pumps could cause a severe lean air-to-fuel ratio with fuel injection systems.


  • Missing or damaged catalytic converters can result in backfires out the tailpipe, but very uncommon, and usually only applies to engines set up for race applications.

Dec 09, 2013 | Cars & Trucks

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Would a bad timing chain or timing belt make the engine shake


It could if its bad enough, but it will also display other problems as well. Hard start when hot, pre-ignition loss of power.

Feb 20, 2013 | Cars & Trucks

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No power backfires,engine code PO134,replaced 02 sensors,map sensor,idle air sensor,throttle position sensor,took to chrysler,paid 150.00 to check,they said they need more time & money.Is a 2000 ULEV...


p0134 is the upstream 02 sensor staying center and will cause a drivability problem. you don't need to replace both of them, the one at fault is the upstream one, mounted on the exhaust manifold.I do it under the vehicle while on a lift, if you can see it from behind the engine and access it, just remove it. spray it down with some penetrating liquid before attempting to remove it

Oct 20, 2011 | 2000 Plymouth Neon

1 Answer

My jetta give back fire when it s running


Backfiring is usually caused by one of two things. One is a bad valve - this allow gas to escape around it and back through the intake if it is an intake valve - or exhaust if that.
Second bad spark plug/firing.,

Check all your spark plug wires - if older than 5 years - generally replace them. If you're on a tight budget then just be sure they are not misfiring. One way to do this is to check at night and see if you see any random sparks flying around near the plug wires.

Replace the spark plugs if they are over two years old.

Best of it
Gary @ Fix Ya.

Jun 07, 2011 | Volkswagen Jetta Cars & Trucks

1 Answer

WONT START AND TRIES TO TURN OVER BUT BACK FIRES


AWESOME a real camaro problem.
backfire.
strong odor of gas because the gas isn't getting burned
caused from backfire. backfiring because the spark isnt sparking when its supposed to.
problems could be bad spark plug wires , bad plugs , bad ignition parts.
your gonna need to check wires for bad spots, check ignition coils and stuff like that. if all that stuff is ok, then your problems have to do with inside the engine. jumped time etc.

Jul 31, 2010 | 1993 Chevrolet Camaro

1 Answer

What causes our 1986 chevy motorhome to back fire through the carburator? This occurs when you first take off, it stops after awhile when warmed up. Carburator has been rebuilt, new plugs, wires and cap....


Backfire in an automobile engine typically results from various malfunctions related to the air fuel ratio. Backfiring can occur in carburetor engines that are running lean where the air-fuel mixture has insufficient fuel and whenever the timing is too advanced. As the engine runs leaner or if there is less time for the fuel to burn in the combustion chamber, there is a tendency for incomplete combustion. The condition that causes this is a misfire. The result of a misfire or incomplete combustion is that unburned fuel or flammable hydrocarbons are delivered to the exhaust manifold where it may ignite unpredictably.


When starting an engine, timing that is too advanced will fire the spark plug before the intake valve is closed. The flame front will travel back in to the intake manifold, igniting all of that air and fuel as well. The resulting explosion then travels out of the carburetor and air cleaner. A common air filter will allow the gases to escape, but will block the flame front. On many small marine engines, no air filter is used, but a screen is placed over the intake of the carburetor as a flame arrest to prevent these flames from escaping the intake, and potentially igniting fuel, or fuel vapors in the enclosed sump or bilge of the boat and causing a fire or explosion. Improperly adjusted carburetors that create a lean condition during acceleration can cause the air fuel mixture to burn so slowly, that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a backfire. In this situation it is conceivable that there is a backfire occurring in the intake manifold and exhaust manifold simultaneously.

Good luck and hope this helps, check the carburetor settings to make sure it's not running too lean and the timing . Keep me posted, be glad to help you get your RV running 100% again.

Jul 14, 2009 | 1995 Chevrolet C/K 3500

1 Answer

Check engine light shows misfires in two cylinders and backfires.


Yes it could. make sure to use the correct champion plugs as well. Make sure your firing order is correct as the intake shouldn't cause a back fire. 1-8-4-3-6-5-7-2.

Jun 29, 2009 | 1999 Dodge Durango

3 Answers

1997 chevy cheyenne c2500...i get a popping noise when i press the accelerator...help meeeeee please...197,000miles i frustrated


Does it idle smooth or rough? Steady loping miss at idle? Loses power as rpm's increase? I'm a shadetree mechanic, and even though your engine is a vortec, it still uses these parts, so you may find this useful.

Make sure your plug wires are good, start it after dark, raise the hood, in darkness you should see tiny sparks jumping from the wires if they are bad.

Most likely cause of my intake backfiring was #5 & #7 plug wires switched. Bad plug wires can also short onto each other and cause the wrong cylinder to fire while it's intake valve is still open, igniting back into the intake. 350 chevy firing order is 18436572. #5 & #7 are on the driver side, the closest to the back. #7 fires right after #5, by switching them I had caused #5 to fire too late / #7 too early hitting the accelerator causes the spark timing to advance, firing #7 while the intake valve was still closing, sending flame up into the raw fuel charged intake, causing the explosion or POP under the hood. The symptom I had was rough idle, stumbling / popping on acceleration, which got much worse as it warmed up.

OTHER PROBLEMS TO LOOK AT:
replace fuel filter, and have a mechanic check the fuel pressure. He can tell you whether the pressure regulator or the fuel pump is bad. Low fuel pressure will lead to engine damage as you'll see below. It causes the combustion gases to run too hot, warping valves.

I have a 95 c2500 with 350 Throttle body injection(not vortec), the problem I had was multiple. The timing chain was extremely worn out, causing erratic timing. The fuel pump was bad( causing loss of power as rpm increased)( letting that continue for 6 mos caused several intake and exhaust valves to overheat, warp and burn). The Throttle position sensor was bad, causing transmission shifting / slamming at odd rpms, and possibly contributing to the popping(backfiring up through the intake). The temp sensor on the intake was bad(cold temp fuel mixture control), and the oxygen sensor on the exhaust pipe had the wires pulled out of it(warm temp fuel mixture control). The spark control module also was bad(causes misfires). Later I also had 2 spark plug wires that were on the wrong plugs(the main cause of the intake backfiring). It is an old work truck, 190,000 miles, many parts/gallons of sweat later, now it runs strong. These motors are worth repairing, as long as the oil-pressure is good and the compression is still decent. I've had 3 vehicles before this one, same motor, great mileage, power and reliability. I've heard the vortecs are even better, as long as the oil gets changed regularly.

Start cheap. Try each item, if that is not it, go to the next( or spend a hundred or so on a full diagnostic by a well established mechanic(not a tire installer who just started his ASE studies. good engine diagnosis requires years of experience and teardowns to be able to determine the causes while running) :
1.) While engine is running in park, use plastic pliers(shock protection, be careful!!!) to remove and reconnect a plug wire at the coil. Listen for a change in the idle speed and smoothness. Move to the next if you hear a change, this means that that plug and wire are working properly(disconnecting them causes the motor to idle up, run rougher). If unplugging them doesn't cause a change: That wire or plug is likely bad. take both to an autoparts store to be tested. Replace the problem part, if that does not fix a miss, see #2 below.
2.) Do a cylinder compression test, to see if you have any valve issues. I bought a $40 compression tester kit. It takes about an hour, but it will tell you alot about the engines health. Mine had a range of 140-170 psi, except for #1( 0 psi, cracked and torched valve) and #7(120 psi, warped valve), I had to pull the intake and that head off for replacement valves(got lucky, cast iron head was not warped)
3.)pull, test(a mechanic can do this) and if necessary replace the throttle position sensor($23 part on tbi motors). This tells the computer how much gas pedal you are using. If it is bad, you fuel mixture will be erratic and can cause misfires, and your transmission may be shifting weird / hard.
4.) Replace the spark plugs with original AC Delco, use good wires, cap and rotor. Cheaper parts can have too much resitance to electric flow, causing poor running. I switched from autolite platinums--> to Delco = huge difference.
5.) If the timing chain is original. It is time, trust me. Mine had so much slop, I was amazed it had not jumped a tooth. This will cause poor power / erratic idle / possible backfiring if really advancing / retarding ignition. Unless you are a mechanic, this is not recommended for do it yourself. The upper radiator housing, fan, waterpump, timing cover and oil-pan have to be dropped and regasketed afterwards. Hours of fun.

my truck sequence of events:
Bought spring '08, noticed poor power / slight miss, replaced plugs wires cap rotor, repaired rear brake line rust-out, new tires, mechanic replaced fuel filter, advised fuel pump was not putting out enough pressure, tried ignoring and drove till fall--> developed REALLY severe miss( no intake backfiring), barely made it home.

Starting this spring: Compression test --> valve issues, removed all front engine components(alt, P.S.(pressed on pulley will need a puller kit to remove)), intake manifold and driverside cylinderhead(found a hole in #1 exhaust valve big enough to slide pencil through), had 4 valves replaced at machine shop, reassembled engine, dropped gastank, replaced fuelpump assembly and fuel-lines(rusted), replaced oxy sensor on exhaust manifold, started motor and set timing(while computer timing wire was disconnected under dashboard), ran rough / intake backfiring upon any acceleration, erratic timing, replaced timing chain = steady timing, still ran rough/backfire though, replaced temp sensor(no change), tested barometric pressure module = ok, replaced distributor(unnecessary), replaced throttle position sensor = ran a little better/still backfiring/ transmission problem fixed too, ran resistance check on wires with ohmmeter-->found #5 & #7 plug wires were switched, fixed that, ran great, replaced exaust system behind the converter, sounds great / runs great / lesson learned. If a mechanic advises a repair, get a second opinion... but don't ignore it, it creates bigger problems, like torched valves.
Good luck.

Apr 28, 2009 | 1995 Chevrolet C2500

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