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What cause the RPM gauge not to move when cranking and the engine service light don't go out when cranking? no spark at the spark (plugs)coils.

There is no spark at the (coils)spark plugs what all i need to check to fix the problem?

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  • Motorcycles Master
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Hi, Joe I would love to help you but you are not going to believe this the batteries in my crystal ball are dead and my mental telepathy headset is broken. I need the year, make, and model of your motorcycle please click on the comment word below and provide this information in the box provided no limit on words and after you post it, a comment alert icon appears on my screen that will allow me to respond to your original question in another comment box below yours. Good luck and have a nice day.

Posted on Dec 18, 2016

  • Joe Russell Dec 18, 2016

    I'm not working on a motorcycle it is a 2004 GMC Envoy SLT 4.2L

  • Gregg Mahin
    Gregg Mahin Dec 19, 2016

    No problem Joe I will re-categorize your question

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1 Answer

How do i use a scan tool to check for RPM when cranking?


Believe you need to plug scan tool into a laptop with the correct software on
Do u have compression as u say u have no spark?

Dec 16, 2016 | Cars & Trucks

1 Answer

There is no RPM singal when cranking why?


If your looking at the dash, Most gauges don't move till the engine is running. If your looking at a scanner and no RPM's. Most likely it is the crank sensor. Could be the wiring/plug. Worse case is the PCM died.

Dec 11, 2016 | Cars & Trucks

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2002 ford taurus missfire or vibrate @ 3000 rpm what could possible be the problem? no check engine lights on


Do you have a check engine light that is flashing, if it is you need to have the fault codes checked with a scan tool to see what is causing this.

Dec 03, 2016 | 2002 Ford Taurus

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I have a 2000 grand prix 3.8 non supercharged.I replaced th head/intake gaskets..plugs/wires..etc. now it cranks but won't start. I used an inline spark testlight(I dont have a helper so I connected it...


Diagnose the no spark first. Check to make sure the crankshaft position sensor is not damaged and is plugged in. Check to make sure the camshaft sensor is also plugged in . Does the car have a RPM gauge? If so, check to see if the needle moves while cranking the engine, this would indicate the crank signal is good. Also, check to make sure the ground wires got attached under the ignition module bracket. The short burst of fuel is not uncommon on an engine that is not running.

Feb 22, 2015 | 2000 Pontiac Grand Prix

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2004 dodge dakota in limp mode wont go past 2000 rpm P2305 code comes on check engine light comes on can reset code but light stays on and wont go past 2000 rpm


Since you didn't say what engine you have, I am assuming it to be a 3.7 L. Code P2305 is set for insufficient ionization of the #2 coil. 1. Inspect the spark plugs for correct application, these should have NGK platinum spark plugs installed. Inspect the plugs for any signs of misfiring, such as carbon tracking on the spark plug insulator or the coil boot. Inspect for cracked spark plugs or incorrect gap. Inspect for any kind of fouling on the spark plugs. Replace the spark plugs or the coils as needed.

2. Verify the wiring is not shorted to ground from the coils to the Powertrain Control Module (PCM).

3. Keep in mind that anything that can affect the air fuel mixture can cause this code to set. Be SURE that there are NO vacuum leaks, the injector is not at fault, etc. Moving parts one at a time (spark plug; coil; injector) to "known good" cylinders is the best way to diagnose this trouble code.

Sep 20, 2014 | 2004 Dodge Dakota

1 Answer

Reasons for cylinder misfires


Ford coil on plug systems are multi strike ignition (spark) under 1300 rpm then go to single strike a single cylinder misfire can be created by several things . #1 Test engine compression on a cranking engine compression it should be around 150 lbs but if gauge reads different COMPARE to other cylinders that work fine #2 check engine running compression this will be around 120 lbs then rev over 2000 rpm and check pressure drop again COMPARE to other cylinders that work fine. any drop would indicate valve train problems. #3 All internal engine is fine then external problems are present vacuum leaks and or fuel injection volume is low.

Jul 23, 2014 | 2003 Ford Thunderbird

1 Answer

Rpm not working and run for a few seconds and cuts off


possible crank sensor problem. the 3800 engines were noted for this failure. although could be a bad module, cam sensor or associated wiring

Aug 31, 2012 | 1997 Buick Riviera

1 Answer

What are the symptoms of a bad coil on my Poulan chainsaw? Mine only sparks at high RPM's, as tested with my electic drill motor spinning the engine and grounding the removed spark plug to the engine...


There has to be a reasonable spark at hand cranking speed, with most electronic ignitions they work off speed of rotation so you do need to crank the engine at a fair speed, check the air gap between the flywheel magnet and the ignition core, this should be around 0.3mm, if there is not spark at all when cranked well it will be a replacement unit required.

Aug 21, 2011 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

3 Answers

Car Misses after replacing the coils and spark plugs


Has the service engine light come on? If so, have the codes pulled and it will narrow down the cylinder that is causing the problem.
If no service engine light, have you narrowed it down to one cylinder or is it random.
Let me know and we will go from there.
Regards,

Mar 27, 2009 | 1995 Buick Park Avenue

2 Answers

Loss compression


How to Test Engine CompressionAn engine depends on an equal compression reading in each cylinder to run smoothly. If poor compression exits in one or more cylinders it can cause a rough idle condition and low power. A compression test can be performed to check wear or internal damage. To start a engine compression test gauge is needed. There are two types of gauge styles, one threads into the spark plug hole which is more accurate. The other style of gauge is constructed with a rubber plug that is meant to be pressed against the spark plug hole, this style of gauge is difficult to use. To perform a engine cylinder compression test follow the steps below.
  • Remove ignition coil connector or ignition system fuse to disable power to the ignition system
  • Test ignition system to ensure that the power to the system has been disabled
  • Remove #1 cylinder spark plug and insert compression gauge, most gauges have a hose attachment that is installed into the spark plug hole with the gauge connecting to the gauge hose.
compression_gauge.jpg
Engine Cylinder Compression Gauge
  • After the compression gauge has been inserted, use the starter to crank the engine over for about five seconds. Use about the same five seconds to test the remaining cylinders.
  • Record the compression reading as each cylinder is tested
  • Remove the compression gauge and reinsert the spark plug
  • Follow this procedure until all cylinders have been tested
  • Compare cylinders compression reading, all readings should be within about 5% of each other
If low compression exists a cylinder malfunction exits and further inspection is required. Possible causes for a low compression condition are: burned intake or exhaust valve, broken piston or piston ring, broken valve spring or a blown head gasket.

May 31, 2008 | 2000 Hyundai Tucson

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