Question about 1994 Mazda MX-3

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Not starting...... Engine wants to start but not starting ..I have compression,spark,good fuel pressure,new plugs,correct timing. please help

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  • Ronnie Wilson May 11, 2010

    Checked for Vacuume leaks

    Fouled pluge also

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  • 57 Answers

If the above information is correct.
1. Good Compression
2. Good Spark & Proper timing
3. Good fuel Pressure, injector pulse , injector spray, & fuel quality( no t contiminated)
4. Proper & clear air intake into engine
Then the likely cause would be a restricted exhaust. disconnect the exhaust at the manifold, and retry starting engine. keep me posted, we will make her run!

Posted on Jan 13, 2009

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Posted on Jan 02, 2017

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Why won't 89 Chevy Silverado 1500 5.7 STILL not start. New battery,coil,spark plugs,wires,inline filter,distributor,cap,rotor,fuel pump,starter relay.


What's missing ? Fuel ,spark , compression ? How many miles on the vehicle ? Does it have spark , pull a plug wire while cranking an hold it near a good ground . Put a fuel pressure gauge on the vehicle , is there fuel pressure ? Do a compression test , 150 psi . engine mechanical problem . timing chain .

Nov 14, 2015 | Cars & Trucks

1 Answer

No start, all new electrical


All well and good but the fuel has to be delivered at the correct pressure to the appropriate combustion chamber when there is a spark.
If your vehicle is diesel powered the engine has to deliver the fuel to the combustion chamber , which ignite/combusts it increasingly well through compressing it as the engine heats up.
If the fuel is delivered at too low a pressure the engine will either not work or will not work correctly.
You should have the fuel pressure measured and, if the engine is gas, have the timing checked, and if it is diesel, check all of the heating circuit, including the glow plugs are all right.
Presumably you have not had a dealer workshop do an OBD
scan to pinpoint what might be the matter
If you think all is ok start of with a compression check, if that proves the engine health to be good carry on the investigation

Jul 21, 2015 | Cars & Trucks

1 Answer

Huskee LT4200. Turns over. Why won't it start?


Any combustion engine needs 3 things to run...Spark, Fuel, and compression. You need to figure out what you are missing. Easiest thing to check is spark. Pull the spark plug and hold the metal base against metal engine casing, and making sure you are holding onto the insulating rubber of the boot, have someone help crank the engine over while you hold the plug there. Look for a good strong blue to white spark at the plug gap. If you have no spark or weak yellow to orange spark you will need to look into the ignition system. New plug is the cheapest and easiest thing to change and test again. If it is still a weak spark then you will need to look to the coil/ ht lead, igniter box, or pick-up. While the plug is out, you can check for compression in the cylinder. If you end up having good spark and good compression then you look to the fuel system. If you can't find a problem with your fuel system, your fuel, spark, and compression also have to happen at the correct time....so you check your timing marks. Simple steps of engine trouble shooting.

Jun 30, 2015 | Cars & Trucks

1 Answer

No start has spark injector pulse, fuel, no codes


did you fix this yet, old post.
which engine, we cant guess that. ever.? (we know it's not a diesel)
if the engine has spark and fuel
and it dont start:
it's flooding? (spark tips soaked in raw fuel, ) we look at them......
did you try the operators guide trick, cranking with wide open throttle?
this cuts fueling , clearing a flood condition.
spec, is 120 to 150 PSI. 4.0L
or 4.7L?
good spark to ALL cylinders is the correct test, not just 1.
does the timing light show correct timing? cranking? spark timing?
ever do a tuneup, with new spark plugs yet.
If the above is true it will start. or at least on test fuel.

one way to find problems like this , if the spark is good.
is to cut all fuel injections. (i kill the fuel pump, ask how.)
and start car with test fuel, if it runs for 3 seconds each try.
then all is good , engine and spark, if not , not.
a simple test. that is. and works on all gas engines.

watch scotty.
http://www.youtube.com/watch?v=064Ilsz8Fzg&NR=1&feature=fvwp

in this case he assumes the engine is good. and timed right.

FSM
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

I can run any engine, with no fuel in car. sure can.
and is safe to do.
use CRC.
http://www.crcindustries.com/ei/product_detail.aspx?id=05671

Feb 07, 2014 | 2000 Jeep Grand Cherokee Laredo

1 Answer

I got a 2000 ford focus that cranks but don't starts, fuel pressure is good, good spark but spark plugs are pretty worn out can that cause it to do that?


You only need three things to start an engine.
1) Clean Fuel / Air
2) Compression
3) Spark

One of these is not working correctly. The fuel pressure is good, but the fuel line, fuel filter, injectors, or carb may be dirty or clogged. If the gas has been sitting for a long time, or could have water in it, there is potential for the gas to be gummed up, and it wont ignite. Start with clean, new gas, line, filter, and if it still wont start, move on to the #2, #3 items from the list above.
Move through the troubleshooting systematically.
Remember, you only need 3 things to get it to run!

Good luck

Mar 19, 2013 | Ford Focus Cars & Trucks

1 Answer

Have a 1985 buick centruy with a 2.5 seems like its loading up with to much fuel wont start.I have spark timing is good, compression good, and changed the temp sensor. tried a different maf sensor(used)...


If you have spark, and the timing is good, you are either not getting enough fuel or there is not enough compression. If you checked the spark from the spark plug wires and got a spark, try changing the spark plugs. The spark from the plugs may be too weak to ignite the fuel.

Have you changed your fuel filter? This is a very common cause of a no start condition. Have your fuel pressure tested to ensure you are getting the correct amount of fuel. Also, you could try replacing your Fuel Pressure Regulator.

Feb 17, 2011 | 1985 Buick Century

3 Answers

The engine turnes but it wont start.


Free Auto Repair Advice by Professional Mechanics




Troubleshooting / Car Engine Cranks but Will Not Start / Engine Crank But Wont Start 2

* Why does my engine stall at idle?
* How do I change my spark plugs?
* Why does my engine stall?
* Why does the engine stall after replacing the battery?
* Why won't my engine crank over?
* How to retrieve trouble codes
* How to test fuel delivery system
* Engine cranks excessively
* Engine has excessive smoke
* Rapid ticking sounds when engine is cranked
* How to tune up your engine
* How to jump start your engine
* How to test an oxygen sensor
* How to open a car hood
* How a flywheel - flex plate works

Engine Cranks But Will Not Start

For an engine to run, you need three things to happen inside the engine, compression, fuel and ignition, without any one of these components the engine will not run. Follow the repair guide below:


Engine Configuration with Camshaft Operation

*

Compression - Engine compression caused by crankshaft rotation and pistons moving up and down inside the engine block. If the timing belt or timing chain fails it will cause the camshaft to become out of correlation with the crankshaft or allow the camshaft to stop rotating. Either of these conditions will cause the engine to lose compression and sometimes cause internal engine damage.
*

Fuel Delivery System - The fuel system includes: fuel pump, fuel injectors, pressure regulator, fuel filter and pressure lines. This system is used to supply fuel under pressure to the fuel injection system, the lack of fuel pressure or volume will cause the fuel delivery system to fail and the engine to stall or not start.
*

Ignition Spark Delivery System - The ignition system components include: spark plugs, spark plug wires, distributor (if applicable), crankshaft angle sensor, camshaft angle sensor, ignition coil, ignition module, knock sensor and PCM (engine control module). The engine relies on the ignition spark to be delivered to the combustion camber at the correct time. If the ignition spark stops or is delivered at the wrong time the engine will not run or run poorly.

If your engine cranks but does not start follow this troubleshooting guide:
* Step 1 - Anytime you have a problem with electronically controlled components such as an engine, transmission, ABS brake, or SRS (supplemental restraint system, Air Bag) inspect all fuses using a test light and check the under hood power distribution center and under dash fuse panels. If all fuses test ok continue to the next step.
* Step 2 - To check for problems with electronically controlled components such as an engine, transmission, ABS brake, or SRS (supplemental restraint system, Air Bag) and the fuses test ok a trouble code scan is needed to identify any system trouble. Use a simple scanner tool to retrieve trouble codes and see if they relate to the specific problem, like a crank angle sensor failure code. If the trouble code present does not pertain to the immediate problem like an EVAP code ignore it until a later time, after the car is running. The reason we repair non-related codes after the engine is running is because sometime false codes can be triggered by the engine not running. Once the engine is running again the code present might cycle and turn itself off. You might say "if the engine doesn't run shouldn't it have a trouble code?" Sometimes conditions occur that will not be detected by the computer, example: if the fuel pump fails the computer cannot detect the failure, so the engine doesn't start and the computer thinks everything is ok with no codes. If no trouble codes are present proceed to the next step.
* Step 3 - The spark plugs in your engine are used to ignite the compressed fuel air mixture. If the condition of the spark plugs are fouled by excessive fuel or carbon the engine will not start, backfire or run rough. Remove all spark plugs to inspect their condition. Please use this spark plug condition reference guide to see how the spark plugs are operating.
* Step 4 - Determine if the engine has compression, this can be done a number of ways but the most complete method is to perform a compression check. Remove the spark plugs and perform a compression test on one cylinder. If one cylinder has compression then the remaining cylinders usually will be close to the same. Crank the engine over about 5 seconds, normal compression readings should be between 125 psi and 160 psi on each cylinder. If no or little compression exists additional tests will be needed. The most common reason for an engine to lose compression is a timing belt or timing chain failure. If low or no compression exists remove the oil fill cap and observe camshaft rotation when the engine is cranked over. If no rotation exists the timing belt or chain has failed. If your engine has a timing belt and you cannot see the camshaft easily remove the upper bolts to the timing cover and gain visual access to the belt, recheck cam rotation by cranking the engine over. Sometimes a timing belt or chain can jump causing the camshaft to lose correlation with the crankshaft and therefore causing low compression. The best test for this condition is to remove the timing belt/chain cover and inspect timing marks. If the compression is ok proceed to next step.
* Step 5 - Test the ignition system output, ignition systems can vary in configuration but operate on the same principal. Ignition systems can consist of a coil, pick up coil, crank angle sensor, cam angle sensor, spark plugs, spark plug wires, distributor cap, ignition rotor and a distributor and any variations of these components. An ignition coil is a voltage stepper coil that transforms a low voltage (12 volts) signal into tens of thousands of volts needed to jump the gap of the spark plug. This coil is activated by an ignition module triggered by using the camshaft/crankshaft angle sensor; timing is adjusted by the ECM (computer).

Hope helps (remember rated and comment this).

Aug 11, 2010 | 1999 Chevrolet Blazer

2 Answers

My vw will crank but will not start running i


Hi,


If the engine cranks over normally when you attempt to start you car, but the engine does not start, the problem may be NO FUEL, NO SPARK or NO COMPRESSION. The engine needs adequate fuel pressure, a properly timed spark and normal compression to start.


1) To find why the engine won't start, remove the air inlet tube from the throttle body, push the throttle open and spray a small amount of aerosol starting fluid into the engine. Crank the engine. If it has spark and compression but NO FUEL, it will start and run a few seconds before dying. If it does NOT start, it probably has NO SPARK.

2)Another method to check for spark is to pull a spark plug wire off of a spark plug (if it has plug wires, coil-on-plug ignitions do not) and place the open end of the plug wire near a metal surface on the engine. Have a helper crank the engine while you watch for a spark. DO NOT hold the wire while doing this as it can shock you. If you see a spark, the problem is not spark, but most likely NO FUEL or NO COMPRESSION. If you do not see a spark, the problem is in the IGNITION CIRCUIT.

3)Proper fuel pressure is critical for fuel injected engines to start and run. You should hear the fuel pump inside the fuel tank buzz for a couple of seconds when the ignition is turned on (no buzz means the pump is not running and the engine is not getting fuel). You can smell the tailpipe for gasoline vapors after cranking the engine. If you smell gas, the problem is likely not fuel but NO SPARK. You can also remove the plastic cap and press the Schroeder valve test fitting on the fuel rail to see if there is any fuel pressure to the engine (not a very accurate test because fuel pressure must be at a certain level for the engine to start, for that you need a gauge). Even so, no fuel at the fuel rail would tell you fuel is not getting to the engine.


Thank you!!

Jun 30, 2010 | 2001 Volkswagen Passat

1 Answer

Isuzu Hombre pickup, 2.2L Vortec, Won't Start.


You need four things for an engine to run. 1. fuel 2. spark 3. compression 4. timing (spark at the right time. By your post it seems you have fuel and spark and you probably have compression unless you blew a head gasket. That leaves the timing. Check the timing and/or the timing belt or chain whichever you have.

Jul 01, 2009 | 1998 Isuzu Hombre

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