ENGINE PERFORMANCE PROBLEM1996 CHRYSLER SEBRING...
1996 Chrysler Sebring
March, 22, 2009 AT 8:08 PM
Engine Performance problem
1996 Chrysler Sebring 6 cyl Front Wheel Drive Automatic 125000 miles
my 96 jxi convertible back fires throught the intake and I know for a fact I have a intake manifold leak from either the upper plenum or intake itself but what I want to know is will it cause the backfiring through the intake? I also have a vacuum leak coming from egr valve tube where it mounts at egr can that cause this also? I have tried replacing intake manifold plenum gasket and cant seem to get the right front corner to completely seal its throwing a 6 cylinder misfiring code on machine can u please help me resolve this issue thanks!
Step 1 - The ignition system in your car is designed to operate at a specific voltage and amperage output. If this voltage/amperage is forced to " spike" due to faulty or inferior tune up parts it could cause the system to " crossfire". A crossfire condition can allow the electrical discharge for a particular spark plug circuit to transfer to a alternative cylinder. Depending on were the cylinder is in the combustion process it can produce a backfire in either the intake or exhaust systems. Always replace ignition components on a regular mileage schedule and use high quality replacement parts.
Step 2 - Engine timing is to be set at a specific degree in relation to the crankshaft of the engine. If this timing becomes miss aligned it can cause low power, poor gas mileage, engine ping and backfiring. To check the engine timing locate the number one cylinder of the engine. This number one cylinder will be the forward most cylinder of the engine. On straight 4 and 6 cylinders engines it is pretty obvious, but on " V" style of engines like the v8 it is a little more tricky. The cylinders heads on every " V" style of engine are offset from one to the other. One cylinder head is more forward than the other. The most forward cylinder head is the side of the engine were the number one cylinder is located. The forward most cylinder is the number one cylinder.
Next, locate the crankshaft timing marks, most engines timing marks are at the front of the engine on the harmonic balancer. Near the balancer there is a small pointer or scale to align the balancer mark too. When the engine is running this gauge or pointer should align with the mark on the balancer. When the engine is running the timing light will strobe and illuminate the balancer mark as it spins. To adjust the timing loosen the distributor and turn slightly one way or the other to achieve the desired setting. Once an adjustment has been made re-tighten the distributor hold down bolt or bolts. Some engine's timing marks are located at the rear of the engine on the flywheel. Before you begin start and run the engine until warmed to operating temperature. Connect the positive and negative leads of a timing light to the battery. Observe the timing tag either on the engine or engine compartment for the timing specification and procedure. If the specification and instruction cannot be found consult a car repair manual.
Step 3 - The ignition system in your car is designed to operate at high voltage. If moisture is present inside of components like the distributor cap it can cause internal ignition crossfire. This crossfire condition can allow the electrical discharge for a particular spark plug circuit to transfer to a alternative cylinder. Depending on were the cylinder is in the combustion process it can produce a backfire in either the intake or exhaust systems. To check for this condition remove the distributor cap and inspect for moisture. If moisture is present dry components thoroughly and reassemble. (Some cars are not equipped with a distributor)
Step 4 - The engine in your car is designed to run on a specific ratio of air to fuel (14 to 1). If this ratio increases by withholding fuel it can cause the engine to back fire through the intake system. The number one reason for this condition is a plugged fuel filter. If your fuel filter has not been changed for over 30,000 miles it probably needs to be changed. Remove the fuel filter and inspect if dirt is observed replace the filter. How to change a fuel filter. (Note: some cars fuel filter is located in the gas tank and are not serviceable). Next the ratio can be incorrect because of an air intake boot that has failed. If a failure is detected replace part with new and recheck.
Step 5 - Your engine's fuel injection system is designed to supply fuel from the gas tank under a specific pressure. If this pressure is allowed to decrease intermitted or regularly by a faulty fuel pump it can cause an engine backfire. Fuel pump that fails intermitted can be tricky to find. Check fuel pump pressure.