Timing and Firing Orders
Air Filters and Intake Manifolds
Chevy 350

Would a loud backfire through the intake manifold while cranking engine on 93 grand am sohc mean that you just ruined a valve cause it started yesterday with no problem and today this happened?

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2006-09-17 04:40:28
2006-09-17 04:40:28

Yes...all valves bent...smacked piston...good old interference engines. Started cranking really fast cause valves stuck open from overheat then...BAM...backfire out intake after only 15seconds of cranking...Head back off again. answering own question. Impossible to say. You need to find out why it backfired. Suggest you do a compression test.

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A leaking spark plug wire can cause a backfire out of the intake, but the most common cause is a burned intake valve. A burnt intake valve will allow leakage during the compression stroke back through the intake causing a popping backfire out of the intake manifold.


A backfire is caused by a misfire... a cylinder fails to ignite the fuel which may cause a stutter, it may also cause a back fire due to it pushing that un-ignited fuel into your manifold where it then ignites from the heat of the other cylinders and boom you have a backfire...


If it is the intake manifold, there will be vacuum leaks, backfire, and poor performance. If it is the exhaust manifold, you will have loud exhaust noise which may warrant a citation - also, emissions control laws will be violated. Take the manifold ro a shop where it can be re-surfaced or try to find a product at your local auto parts store that will help seal the manifold. - Good luck.


The inlet manifold is leaking air, weakening the mixture, OR the engine timing/sparkplug electrode gap is outside specified limits.


I just had the intake manifold gasket replaced on my 96 century yesterday and my bill was $450 but my gasket was only leaking out. If its leaking into your oil it may be more.


It sounds to me like your ignition timing may be off. Is it also hard to start? Possibly a manifold vacuum leak. Check out your engines tune up.


having bad spark plugs could effect how the spark sparks and when it sparks. new plugs is never a bad idea


Most likely you have a misfire caused by an intake manifold gasket leak at #1 cylinder. That or basic misfire stuff like spark plugs or ignition wires. Check the intake


ok, is the backfire through the exhaust or inlet manifold? if its through the exhaust it means ur mixture is to rich, causing unburnt fuel to ignite in exhuast, if through inlet it is a lean backfire, either way if carby in good condition it sounds like mixture screw, to adjust, start car and get to operating temp, wind mixture screw in till car almost stalls then back out 1 and a quarter turns, that's a static point to go from. good luck


If it backfires while you are driving, the intake manifold bolts may be loose or the gasket may need to be replaced. If it backfires when you turn off the ignition, the fuel mixture is a little on the rich side.


It's probably leaking from a bad intake manifold gasket. You could be leaking from the heater hose that comes out of the firewall very close to the manifold. They sometimes leak there and drip down on the manifold. If it drips on a coil, it can eventually ruin the coil. It happened to me.


With Beetles backfiring usually means that (usable fuel) is too lean. The gas fails to burn efficiently and the unburned fuel mixture fills the exhaust system. Add a spark and it explodes. This can be from a vacuum leak from the carburetor/intake manifold flange or the manifold where attached to the cylinder head. This can be be from a number of things, these are just the most common.


A car backfires because unburned fuel is getting to the muffler. The heat of the exhause system causes the fuel to combust, thus a backfire. I have just been told that the rubber on my exhaust has split - could this be why the car would backfire? I have heard something about air getting into the exhaust could cause a backfire? back fire can be caused by different faults. first is to much fuel because of worn carburetter, or wrong adjusments on carburetter. choke sticking will cause backfire. timing be out of adjustment will cause backfire exhaust leak can cause backfire. bad spark plugs, or plug leads , distributer cap worn of cracked will cause backfire as for fuel in muffler, if it combusted in muffler , the muffler would split open it is not that. and i dont know of any rubber on an exhaust that would take the heat aexhaust manifold gaskets could be problem but if they were rubber they would melt \ is it good or bad to have backfire It can also be done with intentional modification, such as done in ''Keeping Up Appearances'' British sitcom. A fuel line and an oxidizer line are added to the muffler with a manual rubber bulb pump added to the line as the ''backfire button.'' At a point before entering the muffler, the lines have a pair of backflow valves to prevent the flame from racing into the mixture tanks. Squeezing the bulbs dispense a mixture of pure alcohol and an oxidizer into the muffler to create a reaction. For Onslow's car in the TV programme, copier toner was squirted in the tailpipe for a heavy soot effect on the backfire command. Having a car backfire can shake off any parts that aren't bolted completely, and can cause the engine to stall because the pressure of the backfire can temporarily disrupt the exhaust release from the engine. Besides, it would spook horses, cows, or anyone not used to loud noises. So having the car backfire down a Harlem road won't have the same effect, as a car backfiring down a rural city road.


There are too many reasons this can happen to be positive, however the most common reason is the exhaust pipe is not snug, or bad gasket at the manifold. Where it bolts to the cylinder. If it is not that, you will need a harley mechanic to look at it.


There is more than one engine and firing order available for that car. Note the direction the distributor rotor turns while cranking. The correct firing order is cast into the intake manifold.


Remove the exhaust pipe from the exhaust manifold. Remove the manifold bolts. Remove the manifold. Remove the manifold gasket and clean the surface. Reverse the process to install the new manifold gasket.


The manifold gasket is the same as the plenum gasket. The manifold gasket is a barrier between the manifold and the engine block.


The intake manifold is where the air and fuel mix and enter the engine. The exhaust manifold is where unspent gas and air exit the engine. In other words the intake manifold is where the engine breathes in and the exhaust manifold is how the engine exhales out.


Manifold means many and various. eg He had manifold failings - too numerous and varied to list. eg Nature in all its manifold splendour


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There are several reasons the engine would backfire, but the three main culprits are a dirty air filter, a loose intake manifold bolt or gasket (vacuum leak), or a faulty spark plug. If the problem is not one of these three, check out a book on small engine trouble-shooting and repairs from your local library. You will find other procedures a little more complicated in the manual to help you trouble-shoot.


Intake manifold on top and exhaust manifold on the side.


A manifold leak is usually in reference to a failure of the intake manifold gasket. It can leak air, oil or coolant. It can leak to the outside of the engine or internally into the engine. A manifold leak may also refer to the Exhaust manifold that is leaking exhaust fumes from a bad gasket or a crack in the manifold.


Remove the retaining bolts from your 2001 Mitsubishi Eclipse manifold. The manifold will come off. Remove the manifold gasket. Clean the surface and put the new manifold gasket on.



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