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No power and engine rpms down - 2000 Mercury Sable

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Check for engine compression

Posted on Apr 26, 2010

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Turbo boost adjustment for mack 470h.p. engine, how do you make this adjustment?


there is none as the engine uses all the boost it can get
if you want more power then have the pump reset to 500 hp settings
boost pressures are a result of the fuel settings from the pump allowing more fuel in to burn which produces a hotter exhaust making the turbine wheel spin faster which creates the extra boost
a genuine mack 470 hp engine is a really torque engine if driven properly and if dyno tested will produce around 450 hp at the back wheels with a relative flat torque curve which means that the rpms hang on longer before having to change gears
however to keep the maximum torque available at rpms you have to drop a half ratio as soon as the rpms start to drop as the range change will be 250 rpms and that will keep the torque range well up
don't let it bog down as all that does is waste fuel and drive time

Jul 02, 2016 | Cars & Trucks

2 Answers

Engine idles rough at red lights begins loping rpms drop to almost killing, then cycles back to normal, then repeats rough idle drop in rpms and loping, back and forth until I rev engine or take off


You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

Mar 02, 2011 | 2001 Nissan Altima

1 Answer

My 1991 Buick Regal (3.1 engine) use to start a high RPMs and then slowly, as the engine warms up, the RPMs would come down to about 800, which is the normal. However a few weeks ago, it started to start...


Hi,
You need to get your engine coolant thermistor checked and tested. This is what tells the ECM when the engine temperature is at normal working temperature and turns the idle down.
But when the idle won't come down from cold to warm this is usually the main fault.
Hope this helps.
Thanks
Jason

Jan 28, 2011 | 1991 Buick Regal

1 Answer

I own a 03 jeep wrangler TJ 4.0. At high rpms or under load (going up hills it looses power) if driving in 5th gear at 60 mph and is down shifted to 3rd gear it slows down extreamly, the engine will not go...


u only did part of the job most people change the air intake first put in a cool box or k&n type which causes some of same problems as opening the exhaust-- ur letting to much air out no back pressure and not enough air going in causing an imbalance also ur going to have problems with o2 sensors/cat sensors also mass air flow down the line

May 06, 2010 | 2003 Jeep Wrangler

1 Answer

2002 Audi A4 3.0 Stalling and bogging down majorly.


Ignition coils has to be the answer. if it was the fuel pump your car wouldnt start. So i would say contact audi. they should have sent you a letter in the mail. We have the same car and i got a letter from them. ignition coils are the recall for the 02 a4.

Mar 27, 2010 | 2002 Audi A4

1 Answer

My 1996 GMC jimmy wants to stall when I come to a stop. The RPM gage goes up & down then drops below 1000 RPMS and stalls.


I would go down to your local auto parts store and do an alternator and battery test. It sounds like at low rpms you are loosing volts. When you apply the brakes you would be supprised how much power from the engine it takes. You could also be loosing oil pressure. Check your oil level. When your engine drops low rpm, the oil pressure drops and shuts down the engine.

Jan 09, 2010 | 1996 GMC Jimmy

1 Answer

2005 Silverado chevrolet 1500 rpms, engine shut off


you may have a vac.hose leaking some were on the motor

Nov 15, 2008 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

Loss of Power


Does temp gauge go up when this happens ? When was fuel filter changed last? If not recently, I'd start there.

Aug 30, 2008 | 2004 Ford F250

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