Question about 1991 Chevrolet Lumina

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Engine rotates but will not start. it has a new inition module, some say its the crank sensor or the timing, i don't know witch.

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  • Jeff Adkisson
    Jeff Adkisson May 11, 2010

    do you have fuel??
    do you have spark??
    do you have compression
    you must have all three for the car to run

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It's probably the crank position sensor. That's what it was on mine. From under the car (on a hoist or jack stands of course) look up between the oil pan and the flat transaxle plate. You will see the sensor, unplug the two wire connector then remove the #8 bolt to get the sensor out of the engine block. This is NOT an easy task if you have hands bigger than a four year old but it can be done with patience.

Posted on Jul 01, 2010

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Three things an engine needs to run, fuel, spark and compression.
If you remove a plug wire, insert and screw driver ( don't damage the terminal in the boot) hold it close to the engine and have some one crank the engine over, do you have spark?

If so, check the fuel pump pressure? install a pressure gauge. When you crank the engine over, you should have 30 to 45 lbs. of pressure immediately.

And last, When you crank the engine over, does is sound normal, in other words, a rhythmic sound.
If questionable, remove a spark plug, install compression gauge and record pressure.

Let me know what you find and we can proceed.
Regards,

Posted on Apr 16, 2009

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1 Answer

Sensor a crankshaft


A crank sensor is an electronic device used in an internal combustion engine to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control the fuel injection or the ignition system timing and other engine parameters. Before electronic crank sensors were available, the distributor would have to be manually adjusted to a timing mark on the engine.
The crank sensor can be used in combination with a similar camshaft position sensor to monitor the relationship between the pistons and valves in the engine, which is particularly important in engines with variable valve timing. This method is also used to "synchronise" a four stroke engine upon starting, allowing the management system to know when to inject the fuel. It is also commonly used as the primary source for the measurement of engine speed in revolutions per minute.
Common mounting locations include the main crank pulley, the flywheel, the camshaft or on the crankshaft itself. This sensor is the most important sensor in modern day engines. When it fails, there is a chance the engine will not start, or cut
A crank sensor is an electronic device used in an internal combustion engine to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control the fuel injection or the ignition system timing and other engine parameters. Before electronic crank sensors were available, the distributor would have to be manually adjusted to a timing mark on the engine.
The crank sensor can be used in combination with a similar camshaft position sensor to monitor the relationship between the pistons and valves in the engine, which is particularly important in engines with variable valve timing. This method is also used to "synchronise" a four stroke engine upon starting, allowing the management system to know when to inject the fuel. It is also commonly used as the primary source for the measurement of engine speed in revolutions per minute.
Common mounting locations include the main crank pulley, the flywheel, the camshaft or on the crankshaft itself. This sensor is the most important sensor in modern day engines. When it fails, there is a chance the engine will not start, or cut
A crank sensor is an electronic device used in an internal combustion engine to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control the fuel injection or the ignition system timing and other engine parameters. Before electronic crank sensors were available, the distributor would have to be manually adjusted to a timing mark on the engine.
The crank sensor can be used in combination with a similar camshaft position sensor to monitor the relationship between the pistons and valves in the engine, which is particularly important in engines with variable valve timing. This method is also used to "synchronise" a four stroke engine upon starting, allowing the management system to know when to inject the fuel. It is also commonly used as the primary source for the measurement of engine speed in revolutions per minute.
Common mounting locations include the main crank pulley, the flywheel, the camshaft or on the crankshaft itself. This sensor is the most important sensor in modern day engines. When it fails, there is a chance the engine will not start, or cut

Oct 05, 2016 | Hyundai Sonata Cars & Trucks

2 Answers

00 Explorer 4.0 ohv v6. If cam position sensor fails will it cause, #1 engine to die at hwy speed 60mph? Also upon trying to restart, it cranks very fast, is that poss. cam sensor failure too? Thanks


No, to the second question- sensor won't make it crank any different. Faster than normal cranking often means a broken timing belt -less friction with the valve train not moving, so engine spins faster. But you have a timing chain, right? Any engine noise when it quit at 60mph? You could watch some valve action through the oil filler cap while the engine is being cranked, to make sure the timing chain is still intact.
If all is good, check for spark and gas to the engine. If stopped while running, it could be a failed fuel pump or a problem in the ignition system- cam or crank sensor, ignition coil, ignition control module, some of the things to check if no spark.

Nov 18, 2015 | Cars & Trucks

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Pcm?


PCM= Powertrain Control Module. It is the brains of the car, it reads the sensor in put from all sensors including the cam shaft position sensor

May 14, 2014 | 2004 Toyota 4Runner

2 Answers

My 2000 honda civic wont turn over and has no spark but the ignition coil and modual are both fine


Won't turn over? Do you mean the starter won't crank the engine over?

Or the engine cranks over and won't start, and you have tested for spark when cranking and have no spark? And then you have tested the coil and ignition module, and they tested out good? Am I on the right page here? If so, maybe the next thing to check would be the crank position sensor. The ecu (computer) signals the ignitor (ignition module) when to initiate spark after it digests the signals from the crank position sensor and the cam position sensor.

Nov 04, 2012 | 2000 Honda Civic

1 Answer

I have a 1998 dodge dokota pickup 3.9 liter engine that want start can somone help me?


reset the computer ... by disconnecting the battery competely (positive AND negative) AND LEAVE IT DISCONNECT FOR ABOUT 20 MINUTES. Then turn everything OFF in the vehicle (AC, Radio, etc....) reconnect Negative terminal first then positive. Don't crank it yet!! Turn the key to on position and leave it there for 1 minute..then off for 1 minute... Do that 3 times. No crank it up. If still no fire you need and ignition module.. get a refund on the cam sensor..they rarely are the problem.. (even though the diagnostics seem to point a finger at them quite regularly).... One last thing DON'T GO PAYING FOR A NEW MODULE...Call a scrap yard and they each probably have a room full of them.. cost you say $20-$40. Hope this info helps!

Jun 22, 2012 | Cars & Trucks

1 Answer

I have a 2000 plymouth breeze it will not start found out iot was the timing belt replaced it an it still won't start.


You need to narrow down the issue. Start with spark meaning does it have any. Then move to fuel delivery and pressure. Without those it doesn't matter what you do it wont start. Fuel is easy to verify just pour a bit into the intake and crank the engine. If it starts you know you have a fuel delivery problem. If it doesn't have spark then you have a coil, ignition module, crank sensor, cam sensor, or knock sensor issue.

One thing you need to be very sure of is if the when replacing the timing belt that both timing marks (camshaft and crankshaft) are where they are suppose to be. Remember the crank turns twice for every one cam rotation. So is it 180 degrees out?

Mar 17, 2011 | 2000 Plymouth Breeze

3 Answers

I have a 1994 Dodge Stealth 3.0 DOHC Non Turbo. It won't start. It only gets fire on one coil. All teh coils are good fule pump works, New crank sensor, New spark plugs and wires, motor been port and...


look did u replace the censor where harmonic balancer is an the an the crank censor they are both like magnitos theres a metal fan blade looking thing that rotates through it make sure its not damaged an locked down let me know my email is lildevil6290@gmail.com

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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
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* How to tune up your engine
* How to jump start your engine
* How to test an oxygen sensor
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* 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

3 Answers

Intermittently wont start after hot soak-will start if it sits 30min. (note-cranks ok)


four options.
Crank sensor, fuel pump, ignition module or a relay
without testing when it stalls its anybodys guess.

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1995 ford explorer doesn't start, crank & cam sensors replaced


Does you fuel pump delivers fuel. Is it there a spark.

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