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115 four stroke pressure drop after 3000 rpm

Pressur drop in fuel over 3000 rpm

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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fischmilch
  • 96 Answers

SOURCE: 1999 Chrysler Cirrus Lxi 2.5l high rpm

The throttle position sensor may be misaligned. This tells the computer how much throttle is being applied, and when they go bad, or come out of alignment, the idle tends to get up there. If that's not the issue, remove your air cleaner, the housing and everything until you get to the MAP sensor. Give it a good spray with carb cleaner, let it dry and replace the air cleaner with a new one. If the MAP sensor detects minimal air flow, the computer jacks up the idle to compensate.

Posted on Nov 07, 2008

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salvidordali
  • 103 Answers

SOURCE: toyota 4 runner fuel pressure

pressuer should actually raise under throttle, but not much. maybe 5psi. 38-44psi is the correct range. if your dropping much I would replace the fuel filter. next I would check the tank for debris or water, finally i would replace the Fuel pressure regulator.

Posted on Jan 10, 2009

  • 1 Answer

SOURCE: pro 115 manual

Dave go to www.desatech.com you can down load and print off a copy of this manual, you will need Adolby 6.0.

Posted on Mar 14, 2009

  • 77 Answers

SOURCE: johnson 4 stroke 115 hp will not start. fuel

Sounds like and injector problem to me. If it was a 2 stroke I'd tell you to pull the carbs and clean them ,but EFI is a whole different story. Most certaintly a fuel problem, most likely injector related, you'll most likely need to go see a marine mechanic with the proper equipment to analyze, rather than start replacing parts you may not need.

Posted on Jun 23, 2009

  • 86 Answers

SOURCE: 2003 yamaha 115 outboard motor that dies when

I would check your fuel lines from the tank all the way to the fuel pump. It seems that you might have a pinched line somewhere. You can also bleed the fuel rail with the schrader valve on the end of the rail. If that wont fix it then you probably have a weak fuel pump.

Posted on Aug 09, 2009

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1 Answer

01 grand prix gt used to go 3000 rpm then 2200 rpm now 1500 rpm


Plugged exhaust , catalytic converter ! Have exhaust back pressure tested , and while your at it have the fuel pressure an flow tested . Also have a professional tech do a look see at scan data .

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The 2005 Isuzu 4HL1 smoother E engine has no power over hills what could be th problem


loosing compression
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if its the DiD ...internal carbon build up

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WHY DOES MY ISUZU 4HL1 ENGINE HAVE A HARD START ALWAYS?


no car stated, huge NPR truck no less.
no year stated
so no free book information on that engine,.
big diesel. 4HL1, no dash letter?
compression at spec.?
glow plugs work.,
filters clean. water in fuel,
does test fuel (spray'd) help? ???
injection problems
lack of startup air.(filter)


The 4HL1 is a common rail direct injection OHC 16V high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 333 Nm, peak power is 140 PS (103 kW) at 3,000 rpm. Maximum torque is (34.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-N is a common rail direct injection OHC 16V high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 333 Nm, peak power is 131 PS (96 kW) at 3,000 rpm. Maximum Torque is (34.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-TC is a common rail direct injection OHC 16 V turbocharged and intercooled high-pressure fuel injection system engine of 4.777 L capacity with electronic control system. Peak torque is 425 Nm, peak power is 160 PS (118 kW) at 2,700 rpm. Maximum torque is (43.3 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-TCS is a common rail direct injection OHC 16 V turbocharged and intercooled high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 500 Nm, peak power is 179 PS (132 kW) at 2,700 rpm. Maximum torque is (51.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.

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1 Answer

Low fuel pressure on mazda rx8 2008 model, car does not accelerate properly on gets full power after 6500 rpm


You will need to have the fuel pressure monitored under a load with a special tool and also drive it for a while and see if the check engine light comes on, if it does have the system scanned and diagnose the codes received.

Oct 18, 2012 | Cars & Trucks

1 Answer

Trouble starting and backfires


I suggest you have a fuel pressure leak down test run on this truck, the pressure check valve that is part of the fuel pump may be defective, this lets the pressure bleed down and this causes your kind of starting issues. The fuel pump is located inside the fuel tank which must be dropped out to replace the fuel pump module assembly.

Aug 23, 2012 | 1995 Chevrolet C1500

1 Answer

I have a 1994 mercury 90 2 stroke . I have replaced trigger , power pac , plugs , fuel filter and coils to start . It run good up to 3100 rpms then bogs down like it only runs on 2. cylinder ! What could...


Have you checked the "Fuel Pressure Regulator", the ethanol in gas these days can cause the tubes to swell and crack... also the little diaphram inside the regulator can get stuck causing the motor to bog down under a load. if you have a book you can locate it. if not you can likely go to Boats.net and enter your motors serial number to seek out parts and it will usually take you to different schematics and diagrams for each part.

I have a Mercury 115 four stroke and did all of the same things that you did... spent upwards of $1,000.00. to do a maintenance overhaul and it still bogged down when i got up around 2800 to 3100 RPM. it turned out to be an $85 part and about 45 minutes to change out my Fuel Pressure Regulator. Its worth a shot!

May 29, 2012 | Mercury Boating

1 Answer

I can't find my manual and no longer remember what the fuel mixture is for my workforce 163cc power washer. Can you help me? Thanks much.


Does your pressure washer engine have a place to add and check the oil level? If it does. And it looks like the picture from your question. It is a four stroke engine and the fuel doesnt need added oil.

Northstar washers are available online at Central Power Equipment.
You might find an electronic owners manual there.

Jul 17, 2010 | Northstar Pressure Washer 3000 PSI

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1994 cougar will turn over but wont start, i put start fkuid and start normal


If it starts when you spray in starter fluid it would sound like a fuel supply problem. Make sure you are getting fuel and have a sufficient supply. Possibly a bad fuel pump or pressure regulator.

Mar 27, 2010 | 1994 Mercury Cougar

1 Answer

Will not idle at proper rpm


Try squeezing the fleixible fuel line before it gets into the fuel rail with the appropriate tool and see if the RPMs drop if they do either the pressure relief valve has failed or the fuel return line is blocked.Obviously you dont completely squeeze the line shut but only that you are taking some of the pressure out of the fuel rail allow enough fuel through to keep vehicle running.Its a cheap way to eliminate a potential cause for your problem.Excess pressure could be over powering the injectors.Are the injectors in a good servicable condition?

Nov 02, 2008 | 1988 Isuzu Trooper 2 Door

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