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Good morning to all, can somebody teach me how to adjust the pressure limits on a MQ3-45, its on 60psi I need to reduce it, it is possible?

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The pump will always increase the pressure 65 psi above the inlet pressure, so if your inlet pressure is 30 psi, the outlet will reach 95 psi. This pump doesn't turn off due to pressure, it turns off when the flow through the pump stops. To make your pump turn off at a lower pressure, install a pressure switch ($20) somewhere in your system. Call the Grundfos tech rep and he will most likely agree this is an acceptable fix.

Posted on Oct 18, 2019

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Posted on Jan 02, 2017

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2011 115hp 4stroke runs strong to 3800 rpm but won't throttle up any higher. Compression is good, injectors have been cleaned and new plugs.


Nearly all the things that could limit the maximum revs of a mechanical unintentional nature would probably cause the power to reduce as the maximum rpm is neared so acceleration would similarly reduce and if climbing a hill the maximum would never be reached.

If your description is accurate and the engine produces normal power to 3800 without tapering and won't go any further it is something only electronic rpm limiting is capable of rather than the usual culprits of strangled intake, strangled exhaust, insufficient fuel or timing problems. Sometimes it was something as simple as the throttle butterfly not opening fully.

Checking the injectors is only half the testing the fuel system should have - the fuel pressure and delivery volume and regulator function needs to be checked.

Opel once made an engine of 1.4 litre and over time it was stretched to 2.0 litres and beyond. That engine pulled strongly until it reached a ceiling of about 5400 rpm, less for a high mileage model. It was impossible to make the intake ports large enough or to maintain a sensible shape to the ports which made the rpm self limiting and was my only experience of what you describe in over 40 years. In all other cases of limited rpm the power always tapered because of external faults.

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Hey i have a 2008 chevy cobalt 2.2 automatic, eng pwr reduced, car takes awhile to start and then when it does starts it runs right rough and only goes 40 km or so


If a warning light is on, there's a trouble code stored in the computer. There are well over 800-1,000 possible trouble codes in the average late model vehicle, so asking us to guess what's causing your problem without knowing the code is a complete waste of time. Get the code read. Post it here. THEN we can help

Jan 11, 2018 | Cars & Trucks

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After two days car did not start. mechanic say it is fuel pressure regulator - full hosing unit. Mechanic blocked off air hose. is it safe and what is the influence on performance?


The regulator reduces fuel pressure at idle. When deactivated, your fuel pressure will be high, possibly reducing fuel efficiency due to rich operation. You should install a new regulator when possible.

Jul 04, 2017 | Cars & Trucks

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Went for ride yesterday drove good parked then in the morning warmed it up and it wont shift in any geer


check transmission fluid level.if transmission fluid level okay have vechicle code scan look for faulty transmission fluid pressure switch or faulty transmission range switch.faulty transmission control module.if all is good make sure transmission manual shift linkage not out of adjustment or shift cable broken if all is good possible transmission just failed.

Feb 07, 2013 | 2000 Oldsmobile Silhouette

1 Answer

Brakes have a mushy to floor response


usually an indicator of either a loss of pressure due to low fluid and/or air in the system (brake fluid leak) or extremely worn rear brakes (if drum brakes in rear). possible causes include master cylinder (internal fluid pressure leak), external fluid leaks (calipers, lines, wheel cylinders), rear drum brakes extremely worn down or severely out of adjustment. normally worn disc brakes may reduce pedal height SOME, but seldom "to floor". but the "mushy" quote combined with the "floor" quote suggests a hydrolic fluid pressure problem.

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1 Answer

I was driving and the reduced engine power light came on and I could onlydrive 25-30 mph


Well I'll tell you my situation and what worked for me. I was headed off to work one day in the morning when the reduced engine power light came on and my top speed became limited to15- 20 mph. I flipped a u and parked in my carport. I did some research online and found too options,. Some say to get the throttle cable looked @ by a dealer, while other suggested cleaning the leads on my battery. I did the latter using a wire brush (I really got in there) and it worked like a champ!. I'd try that out first. Good Luck

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1 Answer

I donot have a good brake i chang every thing in the brake sestem dodge caravan 1997


several possible causes for a soft brake pedal.

One is that the back brakes are probably drum brakes, and they need to be adjusted properly in order to reduce the distance from the shoes to the drum.

Another is that the master cylinder could be leaking fluid back into the reservoir when it should be pushing fluid to the wheels under pressure.

If you have opened and replaced any of the hydraulic system, there could be air in the system that needs to be bled out.

You could also have a bad power brake booster, that would make the pedal had and cause the engine idle to change when you hit the brakes.

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Lifter sound in the morning


check your oil for low level or you probably
need valve adjustment

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