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Eric Posted on Jan 10, 2020
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What's the minimum compression for 2000 Honda TRX 300 atv ? Have 165 psi won't start . Has good spark and fuel.

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CJ Rock

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  • Honda Master 4,424 Answers
  • Posted on Jan 10, 2020
CJ Rock
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That is sufficient compression. Either flooded, no fuel or timing(spark).

Try diagnosing using starter fluid. If it fires and runs for a couple seconds no fuel. Remove air filter and spray a 1 second burst directly into intake and promptly start.

If no fire with starter fluid, flooded or spark(timing). Pull spark plug... if wet, likely flooded.

Brad Brown

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  • Honda Master 19,187 Answers
  • Posted on Jan 10, 2020
Brad Brown
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That is not bad compression, you have something else wrong. IS the fuel good? What is the timing?

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5 Related Answers

Anonymous

  • 59 Answers
  • Posted on Dec 22, 2008

SOURCE: 2004 Honda Civic Ex won't start

if it sounds like it is trying to start you possibly have the firing order off. if that is not the case I would recheck the timing of belt to make sure you dont have one tooth off. stuff like that is so aggrivating, but if you have fuel and fire all you are missing is compression,if firing order isnt off, valves not being completely closed whent they need to be. due to improper timing.

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Anonymous

  • 3600 Answers
  • Posted on May 29, 2009

SOURCE: GMC JIMMY NO START BUT GOT SPARK AND FUEL

try the oil pressure switch, that was a common problem on Gm trucks when I used to work on them, the oils switch was bad and woulden't allow it to start and the ones I worked on were on the back of the distributor.

Anonymous

  • 1 Answer
  • Posted on Oct 09, 2009

SOURCE: 92 Firebird 3.1 L engine wont start many items checked replace

Ill buy it.=D i have a wrecked car but the engine and everything in it is perfectly fine. it will fit into your car and everything.

Anonymous

  • 87 Answers
  • Posted on Dec 07, 2010

SOURCE: My 1991 Honda Accord cranks but won't start. I

If you think there is fuel pressure just because the fuel pump kicks in, you might not actually have pressure. The fuel pressure regulator could be shot which would cause the fuel to go right through the fuel rail and back into the tank. So make sure you use an actual fuel pressure gauge to test that and rule out the pressure regulator...just had to make sure you did that.

If you do in fact have fuel pressure, spark, and compression, then the issue is either your timing or that the fuel is not getting inside cylinder. Timing fix is obvious, the issue with your fuel could be clogged injectors, bad injectors, or the injectors are just not getting the signal to fire. The latter is the most likely. Use a mechanics stethescope and hold it to one of the injectors and listen for a clicking sound when your cranking the engine over. You can pick one up at harbor freight or sears. You could also take a screwdriver and hold it against the injector and press your ear against the handle. However, if the engine shakes while you crank it you might have a very bruised ear...try explaining that one to your friends. If the injectors are not firing, the resistor pack is probably bad. The resistor pack is that thing on the drivers side of the engine compartment with the heat sink on it. Pick up a new one from a junk yard if you want to save a few bucks. That should fix your problem though.

ghost45

PAUL MC G

  • 1280 Answers
  • Posted on Mar 26, 2011

SOURCE: 2001 hyundai accent 1.5l

Replace the throttle position sensor (TPS) (since you've checked/replaced anything else which could be causing this problem - except WIRING). Reinspect all wiring & connectors/connections before replacing the TPS. Also, I've seen (on occasion, a faulty "Main Relay" create the condition you describe). Suppose you have a faulty ignition switch (ignition key). When placed in the 'START' position, the engine starts normally, BUT, when you release IT to the 'RUN' position, the engine dies - CLUE?

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I have a early 80's mercury 7.5 outboard with 60 psi compression in both is that too low? I have good spark and fuel, installed new wiring any advice?

What should the compression be on a Mercury outboard?
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What Outboard Compression Test Results Mean. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI.

Videos as well

https://www.google.com/search?q=80%27s+mercury+7.5+outboard+minimum+compression

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High co reading for emission

what rpm or speed, both? which Civic engine????? of the 5
and what country????? we can not guess this... ever.
and no one ever says.. here. 99% true.
why is not easy. 50ways there are.
it's running rich. (we have one good input. this)

but here are the reasons, (not the 50 causes) all the below are tests.
it's misfiring. is rich misfire.
causes: many I'll assume the cars 12v power is 10 to 145v at all times. 13.3v running minimum.
1: low compression on one or more cylinders. 150psi w.o.t is min.
2: bad spark or not timed right. to any cylinders. or all. tests.
3: bad fueling. above must be good (tools used and tests)

now if compression is good. and the EGR main down leak
if spark is good, what causes high HC,
simple misfire.
what causes misfire.
  1. bad spark plugs (ever tune it up? now be the time, huh?)
  2. bad injectors, leaking or clogged. clean em.
  3. fuel pressure too high, 28 is min, max (see end)
  4. you find one injector , NOID lamp test stuck ON.
  5. o2 sensors stuck lean (exhaust leaks)
  6. Fuel pump regulator stuck closed, causing #3
there are 5 engines, (why not state yours.??????0
1.5 L to 3.0L
the fuel pressure is different on all .
40-47 PSI. 1.7L and 2.3L
47-54 PSI on 2.0L and 2.2L
41-48 PSI on 3.0L
and then the exceptions
1-- Except SULEV: 48-55 psi SULEV: 47-54 2 Except SULEV: 47-55 psi SULEV: 48-55 psi
if you read the FSM,, it shows tests at the rail.
fuel pressure.
fuel regulation test.
shut test
injector leak down test.
and the injector balance test.
we do them all, or fail;.
all this is FSM.

do you want us to guess or test?
the latter avoids the 50 guesses. 49 being wrong.$$$$$$$$$$$$$
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93 Honda Civic dx will not start. new fuel pump igniter, has spark

sorry if you guess and guess wrong. really, must be expensive.



ok got spark (and timing is good, timing light test)

if test fuel ( use instant start in a spray can) fails, with spark

then engine is bad, compression is checked, see near 80 not 150+ PSI , the timing belt has slipped. if not changed by the book

they slip and the engine grenades (or bends valves)



this is an interference engine, never ignore the belt.

there is an acid test order.

1 compression good.

2 spark good, and timed

3 fueling is last. (if spark plugs dry add fuel, by hand)



cant burn fuel with no compression and spark. well with EFI it cant run right with bent valves either.



here is Chad running an engine (any) with no gas tank

even his battery is dead. and has external battery. for 12v power.

a real trooper.

ive done this 1000s of times. in 60 years.

his engine only makes 80 psi (old) and still starts.

but EFI will never do that not that low. compression



the cam slips and goes retarded compression drops to near 1/2

and the valve timing is so bad, the exh opens late and pollutes the

next last intake charge. the card house falls and then the valve bend.



take if from me, nostarts are a blessing on any honda

maybe it saved your valves.? do the service on time./
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When you say it fires, are you checking for spark at the plugs ?
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Hi, if an engine cranks but refuses to start, it lacks ignition, fuel or compression. When the engine cranks normally but won't start, you need to check ignition, fuel and compression. Ignition is easy enough to check with a spark tester or by positioning a plug wire near a good ground. No spark? The most likely causes would be a failed ignition module, distributor pickup or crankshaft position (CKP) sensor.
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I have a 2001 Lexus rx 300 with a check engine light on with code P0301 cylinder 1 misfire. The spark plugs and ignition coils were already replaced. I swapped fuel injectors with known good cylinder and...

The minimum compression required is 95 psi, below this there is no good combustion, incusive the spark plug gets wet in gasoline
If this condition exists, you should check the piston rings and cylinder surface
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Cranks but wont start

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.
Basic Checks:

A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)
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Doesn't start

1. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
2.Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
3.Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
4.Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
5.Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)
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