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New mower been used 4 times. starts but then the engine pulses up and down constantly. how do I fix it?

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Did it do this after it sat through the winter? If yes, you may need to clean the Carburetor. Ethanol gas is ***** to these carbureted engines

Posted on May 11, 2017

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1 Answer

Engine runs but pulses constantly.


reeving up and down is a sign that there is a fuel issue. check fuel lines, filter and clean carburetor.

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No spark on 03 dodge neon


There is voltage on all three wires because there is no ground, check with engine cranking. The two wires that go to computer are grounds for coils. You could probably use a noid lite to check for pulse, engine cranking. That should be safe, between primary voltage and one of the grounds. There several ways to visually check for a pulse. If your digital multimeter has a min/max setting, that should work. You could use an l.e.d. but you would have to use resistor.
You changed computer, was it new?

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My 1990 Toyota's #3 cilynder makes no difference with spark plug wire disconnected.


Yes you can test the injector pulse signal with a tool called a "NOID LIGHT". You can buy this handy little tool at any auto parts store like NAPA or Carquest for about $5, it plugs into the injector connector and flashes each time the injector is commanded to open by the processor. I personally think you have a defective wiring harness on the engine.

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Mountfield push along LS45 mower. Why does it pulse as it runs and make puffs of black smoke?


sound like you need to clean the carb the primer bulb is only used to start not run

May 20, 2012 | Garden

1 Answer

1986 pontiac fiero won't start, changed fuel pump and relay gas coming up, but no spray from injectors


Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
With that in mind, the injectors are supplied with +12V via a 3 AMP fuse labeled INJ 1 for 1 bank of 3 injectors, and INJ 2 for the 2nd bank of injectors. Make sure your injectors are getting +12V whenever the key is ON or they wont fire (or at least 3 won't).
If all 6 injectors have +12V and you have fuel pressure (checked by pushing down in the center of the Schrader (tire valve stem looking thing) valve and fuel SPRAYING out, and your still not getting fuel it is probably because the injectors aren't pulsing. They are probably not pulsing because the ECM is not receiving any reference pulses from the distributor. If you have spark then you are producing reference pulses.
I hope some of this explained from an actual '86 Fiero GT 2.8L V6 owner/mechanic will help narrow down your problem.

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1 Answer

Where is the cam sensor on a 2005 dodge neon sxt 2.0


Camshaft Position Sensor-On top of engine Operation The Engine Management System (EMS) uses the camshaft position sensor to manage sequential fuel injection and as part of misfire diagnosis. The EMS constantly monitors the number of pulses on the signal circuit. The EMS compares the number of camshaft sensor reference pulses and the number of crankshaft position sensor reference pulses received. If the EMS receives an incorrect number of pulses, Diagnostic Trouble Codes (DTCs) should be stored in the EMS. Some engine management systems will then default to multi-port or "gang-fire" injector operation. The camshaft position sensor signal is required to sequence the injector operation to the proper cylinder timing. If the camshaft position sensor or circuit is faulty, most engines will start. However, the EMS misfire diagnostic will likely be affected.
The following symptoms can be caused by an intermittent wiring connections or faulty signal to the EMS.
Related Symptoms
  • Extended crank time with a cold engine
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Aug 05, 2010 | 2005 Dodge Neon

1 Answer

Poulan lawn mower, Briggs Stratton engine, revving problem


Most likely problem is dirt?moisture in the carburetor float bowl. You would have to remove the bowl, clean it out and also clean the main jet up in the center of the carburetor. Another problem could be that the governor is out of adjustment but this is not something a novice could or should do

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1 Answer

Poulen mower B&S 4.5hp engine "hunts" up and down


The diaphram between the carb and the fuel tank needs renewing.

Jun 13, 2009 | Poulan "Poulan" Push Mower

1 Answer

Wont start


Make sure that you're getting spark. A very common thing on these engines are coils going bad. If you can verify spark, check to make sure you have an injector pulse. As you rotate the engine, look inside of the throttle body and make sure that you see fuel pulsing into the engine. You can still have good pressure but you don't have an injector pulse, the fuel still cant get into the engine. You can use a test light as well to test for an injector pulse. One wire going to the injector will have constant power and the other will blink when the engie is rolled over. Does it start if you spray starting fluid into the throttle body? If it does, it's a fuel delivery problem. Again be sure you have spark from coil to distributor and plugs. You can remove the ignition module and take it to NAPA and they have a module tester. Have them test the module several times not just once. This will eliminate the possibilites of an intermitted problem. Let me know how it does. tiqautoperformance@live.com

Aug 21, 2008 | 1989 Chevrolet C/K 3500

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