Question about 1999 Buick Century

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The car runs but skipping multiple misfires get 40 lb fuel pressure is it something to do with timing chain

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It could be the timing belt, it could be bad valves, or it could be worn loads on the cam shaft. If you are lucky it may just need a simple tune-up. Try the tune-up before you get into the expense of major repairs.

Posted on Jul 10, 2010

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01 dodge stratus r/t, 3.0, replaced lifters, plugs, wires, distributor cap, and all timing components. Car runs but throws a multiple misfire code and the engine rpm fluctuates up and down at idle


multiple misfire codes can be from injectors and fuel pressure problems
check for harness connections and problem fuel pressure regulator
check that the wires to the regulator or vacuum hose is properly connected

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Why is my 2003 gmc v8 envoy skipping & shaking


You are misfiring. If you have Autozone (or similar) research your check engine light, they will come up with one or more of the following codes P0300, P0301, P0302, P0303, P0304 etc. etc.P0308. The P0300 code refers to "Random/Multiple misfires" whereas the other codes refer to that particular cylinder (last digit) misfire. The P0300 code sets when 2 or more cylinders misfire (can be the same 2 over and over, but it takes at least 2 cylinders to misifre to set that code. The others only take one misfire to set the code. Now that you know what is happening, here is how to fix....
Takes all to fire a cylinder (Fuel, Spark, Air & Timing) properly. If you have random or multiple misfires, it is likely something that is COMMON to all cylinders - like the air intake/throttle body area - throttle body can get carbon buildup and not open/close properly. Check the fuel pressure to the fuel rail(s), fuel filter clogged? When you turn your key to the "ON" position, do you hear the fuel pump turn on (whine) and then shut off? No whine, means no fuel pump. Check all fuses and fuse relays related to the fuel delivery system. Check the distributor cap/rotor for any signs of carbon tracking/arcing. Do you have good spark from coil? Check wiring for the Camshaft Position Sensor/Crankshaft position Sensor for timing issues. Finally, check compression on all cylinders. Need good compression for combustion to take place.

For a single cylinder (example Cylinder #2) - Easiest to check is spark. Pull the plug and look at it. Is it wet and smell like fuel? If so, then swap it with cylinder next to it. If the problem moved, then its the plug. If the misfire is still on Cylinder #2, then swap the plug wire (both ends). If the misfire is still on Cylinder #2, then swap the coil. (see where this is going?) If the plug is dry, then check the fuel injector for operation. Noid light tester or you can get a long screwdriver and stick one end on your ear and the other on the injector - it should make a steady, rhythmic clicking sound if it is functional when caricon1.png is running. No sound? Replace. Is the plug oily? Check cylinder #2 for compression. No compression or little compression means either head gasket blown or bad/sticking valve (intake or exhaust) = big money to get fixed. Timing on one cylinder is hard to test without correct test tools. Timing is likely not a problem on a single cylinder misfire. Good luck.

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1 Answer

2003 town and country obd2 code p0300 fix


That is the multiple/random misfire code, as I'm sure you have researched by now. Do not rule out a fuel delivery problem such as defective fuel pump or plugged filter. Have your fuel pressure tested before you spend more money on parts. Low fuel pressure will cause lean mixture in some or all cylinders, thus multiple misfires. What symptoms are you experiencing, and when? Such as runs good cold but spits and sputters when warmed up etc.

Apr 21, 2013 | 2002 Chrysler Town & Country

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I changed the plugs and wires on my 2003 trailblazer. I gapped the spark plugs @ .040 and checked all of the connections. Now my engine skips. It gave a 0300 code ( multiple cylinder misfire). Any...


if its a multiple missfire then i would suspect your fuel pressure is dropping or your regulator has failed and is sucking too much fuel causing the computer to overcompensate, these engines are also known for intake leaks

Mar 28, 2011 | 2003 Chevrolet Trailblazer Ext

1 Answer

95 S10 blazer 4.3 vortec skipping code po172 and po300 possible solutions


P0172 system too rich bank 1. P0300 random multiple misfire. All are a common symptom of either bad fuel pressure regulator or leaking injector. Need to pull off intake plenum (upper) You should visibly see a clean side or part of intake manifold (lack of carbon buildup) Reconnect fuel lines. Energize fuel pump (turn on key to run) Most likely you will see fuel dripping out of rear (fuel pressure regulator) or nylon lines to each cylinder (fuel injectors). Once you see which is leaking will need to replace. Once they are repaired will need to clean or replace spark plugs & change oil & filter.

Jun 26, 2010 | 1995 Chevrolet Blazer

1 Answer

I have problems with Misfire detected in multiple


The misfire is probably due to the lean condition.

The lean condition has several possible causes...
1. plugged fuel filter
2. fuel pump failing
3. fuel pressure regulator failing or stuck
4. injectors plugged

A good course of action is to replace the fuel filter, then run some fuel system cleaner, such as sea foam, through it. If that doesn't do it then check fuel pressure and diagnose whether it is the pump or the regulator.

Apr 28, 2010 | 1999 Jeep Grand Cherokee

1 Answer

1999 Avenger runs rough. Multiple Misfires


The crankshaft position sensor may be the cause of the problem, or your timing belt skipped a tooth. Hope it's the sensor.

Dec 04, 2009 | 1997 Dodge Avenger

1 Answer

Chech engine light code OMDII 300 vehicle back fires from stand still till speed 35 to 40 mhp 1998 corolla can you help


OBD II 300 Random/Multiple Cylinder Misfire Detected

When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.

Possible Causes:

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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