Question about 1993 Mercedes-Benz Mercedes Benz 300 Class

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M/benz injector six cylinder engine

Engine is mis firing. When u turn on the engine it takes a bit of time to start. At times the engine stops when its on.

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I took it to the mechanic

Posted on Oct 08, 2008

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Changed can shaft in 88 Chevy now its not firing


Is it not firing as in no spark on the plugs, or is it not firing as in engine turning over and not starting?
An engine wont start for one of three reasons - one, no compression, two, no gas, three, no spark.
Start with no. three because it's the easiest to check. take off a plug wire, put something metal in there - phillips screwdriver, long nail, or if you're brave, you finger. Be careful, there should be anywhere from 20 000 to 30 000 volts in there, it won't kill you but it will make you say "darn" in a most unusual way. If there is no spark, there is your problem.
Secondly, check for fuel The easiest way is to spray a little Quick Start (ether) down the carb tube. If it fires now, that's your problem - no fuel.
Now for the worst part. Do you have compression? You worked on the cam shaft, so there is a likelihood you've got the timing wrong.
If you are unsure of the timing marks, you can check your valve timing (cam timing) on the valves.
Now this depends on what engine you have in the vehicle. Chevy made a bunch of models with a wide variety of engines.
You need to determine the opposing cylinders. On a six cylinder motor, that's easy. The firing order is 1-5-3-6-2-4, always (sorry, unless it is a V-6) On the straight six, the opposing cylinders are 1 and 6, 5 and 2, 3 and 4. What this means is that when cylinder no. 1 is up and has done its exhaust stroke, ready to go down for its intake stroke, its opposing cylinder (6) is at the top of its compression stroke, ready to fire for power.
What does all of this mean? If you look at the no 1 cylinder - always closest to the radiator, you need to turn the engine by hand until you see the valves "rocking", that is, the exhaust valve will move up at almost the same time as the intake valve is moving down. The opposing cylinder's valves will now both be closed.
Now, turn the engine until no. 6 is rocking, look at the front engine pulley and check that the timing mark is aligned with the mark on the block. If not, the valve timing is out and must be reset.
On a 4 cylinder, the timing could be either 1-3-2-4 or 1-3-4-2 or 1-4-2-3 Only VW and Porche boxer engines fire 1-4-3-2
Find out your fining order, the third cylinder will be the opposing cylinder to no. 1 and take it from there. V8's are a curse, but again, find out the firing order and the fifth cylinder will be the opposing one to no. 1. Good luck.

Oct 06, 2014 | Cars & Trucks

1 Answer

Miss fire cylinder 4 1998 chevy metro lsi


check the injector for that cylinder as the electrics is not the only thing to cause a misfire.. Put the injector in another cylinder and see if the misfire has moved

Mar 01, 2014 | 1998 Chevrolet Metro

2 Answers

Mulitply cyclinder mis fire


Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A misfire diagnostic code P0300 indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a random misfire code doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include the engine may be harder to start, the engine may stumble / stumble, and/or hesitate and other symptoms may also be present.

If you need this or additional details about DTC Fault Codes, feel free to contact us clicking the links.

Hope this helps and have a nice day.

Oct 26, 2011 | Mitsubishi Outlander Sport Cars & Trucks

1 Answer

ENGINE IDLES ROUGH IVE CHANGED PLUGS WIRES COIL MASS AIR FLO TPS AMBIENT AIR IAC AND STILL SHOW MIS FIRE ON # SIX CYL ANY SUGGESTIONS THANKS


You might want to look at that injector for that cylinder.I worked on a GMC Jimmy that did the same thing and I also changed all the sensors come to find out that my injectors and the spider assembly needed to be changed.

Feb 23, 2011 | 1998 Ford Explorer

3 Answers

3.4 GM v6. dead skip on #4 cyl. Spark plug ok, wire ok, replaced injector. Still dead skip. Found cyl. by disconecting wires to injectors. #4 not affected.


The very first thing that you should do after finding a cylinder mis-fire that can not be easily explained such as a fouled spark plug, is to take a compression test especially of the mis-firing cylinder to be certain that the mis-fire is not caused by a mechanical problem, and I have seen people spend a lot of time and money trying to hunt down an electrical problem when the actual problem was a mechanical one, and no electronic part will repair a burnt or bent intake or exhaust valve.

Jun 06, 2010 | 2003 Buick Rendezvous

1 Answer

2001 PT CRUISER MISFIRE CYLINDER 2


Do you know how check the engine codes? Turn the key 3 times and the codes will be displayed where the odometer number is displayed.
If the code is 302 it is spark plug mis fire.
It could be a bad fuel injector.

May 26, 2010 | 2001 Chrysler PT Cruiser

4 Answers

My gas in mixing with my oil in a 1992 ford explorer what is causing this and how do i fix it


Change the intake manifold gasket, that means taking the whole top part of the engine apart.

Dec 21, 2009 | 1992 Ford Explorer

2 Answers

Engine cylinder mis-fire


standing in front of car cylinder # 1,2,3,4 on the left passenger side and # 5,6,7,8 on right drivers side. in that order for 2000 4.0 jaguar s type

Mar 31, 2009 | 2000 Jaguar S-Type

2 Answers

2002 hyundai santa fe 2.7 multi misfire number 2and 5 cylinders


OK IS THERE IS ACTUALLY A mis-FIRE THIS VEHICLE SHOULD BE SHAKING DURING IDLE AND ACCELERATION IF IT IS, here is what you do get a noid light this used to check injector pulse. This vehicle will set a misfire code if injector is not functioning efficiently or bad. A noid light is like a test light bulb can be bought at almost any auto store.SART UP VEHICLE AND DISCONNECT THE INJECTOR WIRE TO THE CYLINDER THAT'S mis-FIRING AND CONNECT noid LIKE TO ELECTRICAL PLUG. DO THIS ONE CYLINDER AT A TIME. The nod light should have a steady flickering light/consistent pattern of flickering. If there is Gap/irratic flickering or no flickering BINGO you have found your problem. NO FLICKERING= bad/broken injector wire if not broken BAD COMPUTER/ECU. IF THE FLICKERING IS CONSISTENT /GOOD = BAD INJECTOR..replace injector and solve the misfire problem. However is all the components tested are ALL GOOD. Then the only other SOURCE for a mis-fire is the camshaft sensor that provides reference for injector pulse and the crankshaft sensor provide reference for Spark pulse. JUST ON A LAST NOTE: make sure all oils are getting electrical power to them. Good Luck I know this is alot of info at once. Contact me if you need more help. Thanks fr using FIX YA

Jan 08, 2009 | 2004 Hyundai Santa Fe

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