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I have a polaris 99 sltx 1050 modified 81.50 i have checked everything but pressure test. I have spark fuel reeds are good new piston and rings 100 on mag cylinder and 110 on two and three starts and runs smooth but mag cylinder is not igniting. Cold to the touch. What should i check next

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Posted on Jan 02, 2017

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SOURCE: 99 tacoma

Still need the codes.
Injectors can go "bad" in a couple of different ways; all they are is an electromagneticaly controlled nozzle. When the ECU "fires" the injector, it pulses a ground circuit for 4-8 milliseconds, the electromagnet powers up, the valve at the bottom of the injector opens, and the fuel shoots out, under pressure. The wire can be bad/chafed/corodded/ The electromagnet may be weak. The nozzle may be stuck. Lots of things. But, to put in an injector for a number 4 cylinder misfire (p-0304 code) would be one of the last things that I would do.

Posted on Nov 21, 2008

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SOURCE: 97 jimmy wont start

Check for a bad distributor cap and or rotor..........a bad cap and or rotor can caues firing (cross fire)across the terminals and introduce spark to the wrong cylinders at the wrong time.......
hope this helps.....good luck!

Posted on Dec 14, 2008

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SOURCE: Check engine light comes on temporarily - engine chuggs at idle

Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

Posted on Mar 12, 2009

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SOURCE: 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.

Posted on Aug 07, 2009

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SOURCE: 94 saturn 1.9L flooding out

i bet the coolant temp sensor is bad,,,when the sensor cracks coolant leaks into and wrecks it and then the coolant leaks thru the sensor and into the harness,,,and this causes the car to dump too much fuel because the computer is seeing a temp that is not real and therefore the air fuel mixture is off and flooding the car,,,typical issue,replace the coolant temp sensor and then harness,,like $75 for both at saturn,,do not by the aftermarket ones,yes the cost less but they are junk and will not work either,,,also i bet if you put the gas pedal to the floor or pump it when this happens i bet the car starts and smokes when it does,,,,saturn redsigned the sensor for this reason,it was plastic and they made it brass so now it can not crack and leak,the aftermarket ones are still plastic junk

Posted on Oct 09, 2009

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3 Answers

Can a bad fuel pressure regulator cause a misfire on one cyl?

no- the fuel regulator regulates pressure in the fuel manifold to which all the injectors are connected
if it is just the one injector then
it is the injector
the wiring to the injector
blocked tip for the injector

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yes this can the fuel injector only

no other way

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I have a 1996 polaris sltx 1050. it runs good but the engine will cut out after every half mile or so but it will start back up immediately and keep on going for another half mile and cut out again.

Hi Steven:
Sounds like it may be a fuel restriction situation.
I'd suggest that you try replacing or cleaning the fuel filter.
Also check to make sure that the fuel tank vent is not obstructed.

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Just rebuilt my 95 mazda millenia S 2.3l miller cycle engine. Complete rebuilt from new piston rings and polished pistons and heads to all new bolts from head bolts to valve cover bolts. Did everything by...

You have to get to the basics, Fuel, Air, Spark.
Check to make sure there is decent spark on each cylinder, Check Fuel pressure at the rail. Let us know the results

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I have a 1987 ford ranger the engine turns over but it wont start

Timing could be 180 degrees out try switching plug leads on distributor i.e. 1&3 2&4

Dec 21, 2014 | 1987 Ford Ranger

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What engine size ? Did you check for vacuum leaks at the intake manifold . How many mile's on the engine ? Oil in cylinders ? weak piston rings , what kind of compression reading's ? Do .compression testing .Have it hooked up to a factory or professional scan tool to check engine sensor data . Unless you like just replacing parts and making part stores rich . Your vehicle also has electronic fuel control , fuel pump driver module ! There is a fuel pressure sensor on the fuel injector fuel rail ! Tell's the PCM how much pressure ! 39 psi is good engine off or idling .

Ford Electronic Returnless Fuel System Diagnosis Part 2

Fuel Pump Driver Module Applications
The fuel pump driver module (FPDM) communicates diagnostic information to the powertrain control module (PCM) through the Fuel Pump Monitor (FPM) circuit. This information is sent by the FPDM as a duty cycle signal. The three duty cycle signals that may be sent are listed in the following table.

Jun 01, 2017 | Cars & Trucks

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Engine cranks no start key on engine off rpm reeds 575

i want to buy comma's so bad.
Engine cranks, but it don't start,
with key on,
engine off rpm reeds 575. (im cluesless here)
reads RPM 575 , not running and how pray tell did you
resolve the 5 at the end? what device showed that?
digital tacho or a scan tool? or dash tach? please tell this.

that is a good input , if true. the tacho on many cars is from
the spark primary signal, and if dead the car will not start.
is this a N.American car/ (unstated?)

the first checks (we go from easy to harder, and more tools)
1:got spark?
2: got fueling if spark is good, the ECU cuts fuel if it even suspects bad spark is true.
never look for bad fueling if the ECU reports bad spark.
that takes a scan tool to see what the ECU thinks, and sees.
got a scan tool they only cost $7, here.

If engine compression is at spec. W.O.T.
and spark is good.
then test fuel works all above is good,(mostly), if test fuel works
and it don't start up and stay running, with a fast right foot.
then the fueling system parts are bad.
this works for carb cars or EFI , this part is no different.
old school to new.

see scotty do it.

Sep 26, 2013 | 2004 Suzuki Forenza

2 Answers

I have a 99 sienna and the cylinders have low pressure what can i do?

If cylinder compression is too low, the car may not even start because of it. Have a shop do a compression test or a leak-down test to check the internal health of your engine. A good engine should have pressures of 150-200 psi in all cylinders and be close to each other. A worn or high mileage engine may have pressure as low as, say 125 psi, but if still balanced (close readings), would still run decent. Compression below that, especially below 100 psi, is serious trouble. ignition spark refuses to ignite the air/fuel mixture and you get a misfire-a non-working cylinder. Low compression can be caused by worn piiston rings or poor valve sealing. Low compression in 1 or 2 cylinders can be a valve problem, burned valves or valves not seating properly.
A leak-down test will check each cylinder and if there is a problem, the test will find the cause of the problem.

Dec 11, 2012 | 1999 Toyota Sienna

1 Answer

While driving at 60mph engine quit after tests=fuel ok/spark ok/timing ok/ NO COMPRESSION 3 CYL. 1 HAS 80PSI

It sounds like you need new piston rings. Cylinder compression for a 1997-2002 Ford Escort from the factory is about 200 PSI. 180 through 200 PSI is good, below 180 usually means the Piston Rings are worn or a possible crack in the engine case. If your going to have to take the engine apart to replace the rings, you might as well have the engine overhauled (replace everything while it's apart). Usually the overhaul interval is every 250,000 Miles or sooner. Something you may want to try if you need the car to last a bit longer, try one of those additives that are suppose to help improve commression that you add to your oil, they should sell it in the automotive section at Walmart, though it's very likely that it will not work.

Another simple test to verify everything is a Drop-Down (differential pressure) test, you can buy a drop-down tester at Harbor Freight. You use an air compressor to compress your cyliners with this and you remove your oil cap and listen for leaks. Most of the time air will leak past the piston rings, but with this test you can also check for cracks in your engine case. This should verify if it's the rings or not.

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1 Answer


check fuel, sparks,engine pressure.
if no sparks check the crankshaft & camshaft sensor
if no fuel replace fuel pump
if no pressure remove cylinderhead you may find
cylinder gasket damage , valve bent, piston rings need to be replaced
good luck

Oct 23, 2009 | 1997 Mazda Protege

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