Question about 1996 Volvo 850

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High RPM when starting

When I start the car the RPM's go as high as 3,000 for a second or two then drop down to between 900 - 1000. What is causing the motor to rev up so high before flattening out.

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Possible vacuum leak on one of the hoses, use a can of carb cleaner and spray the hoses and around the intake to locate a possible leak, the engine will rev up if you hit one.

Posted on Aug 23, 2008

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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? ???
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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.

May 31, 2016 | Isuzu Cars & Trucks

1 Answer

Why does it idle at 2,500-3,000 rpm then drop to 1,000 rpm in drive or reverse?


Hi Paul:
Here are my random observations:
- 2500 to 3000 is really high for "idle"
- Putting it into drive or reverse engages the transmission and puts load on the engine through the torque converter. Since the RPM is high enough that the vehicle thinks it should be moving, the transmission will engage and rpm will drop since more power is needed.
What to do? How long since tuneup?
History? Did this just start immediately, or did it sneak up a bit at a time.
Make, model, engine, year, Kms or miles. Give us some info and someone who is a better transmission specialist will probably kave some more ideas.
Cheers.

Feb 28, 2016 | Cars & Trucks

2 Answers

High idle at start up 2200rpm then slowly drops but always seems high have to ride brakes to stop


Long High idle after start up - YotaTech Forums

www.yotatech.com/f116/long-high-idle-after-start-up-246386/
Dec 20, 2011 - aviator's Avatar ... When the high idle is no longer needed the piston retracts and the throttle ... Sometimes the piston gets gunky and slow to react... clean the ... you are already idling higher then normal the idle up will only be worse... for ... it takes to kick down when I first start it up, high idle is at 2200 RPM it ...Missing: lincoln

High idle at start up - F150online Forums

www.f150online.com/forums/v8.../306364-high-idle-start-up.html
Oct 27, 2007 - ... King Ranch · Lightning · Lincoln Blackwood & Mark LT · SuperCrew · SVT ... my 2000 when its been sitting goes up close to 2k then drops down in seconds. ... so what your saying is when it's cold outside I can expect it to start andidle at 2200 rpm. sounds pretty off to me. ... Vehicle: 2004 Ford F150 5.4L. 4.6l Intermittent High Idle. Why?
Jul 12, 2005
Dual remote oil filters????
Jun 29, 2001
More results from www.f150online.com

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1 Answer

93 mustang 50v8 engine what causes engine to quit running at high rpm then restarts as rpm falls


So is this the only issue your having? Is the stang hard to start cold or warm? Hard to say with what youve asked....Is your TFI newer how about your Dizzy?

Jul 01, 2014 | 1993 Ford Mustang

1 Answer

1997 acura cl 2.2 revs up to 1500 rpm and down to 1000 rpm just several seconds after start


Cars are design to run at a higher idle at start up to warm them up quick. There is a sensor that reads water temperature and tells your car's computer how fast to idle. Your RPMs seem slightly high but not out of the norm. Does idle ever drop to around 600/800 after about a minute? If not, your engine temperature sensor maybe defective.

Mar 16, 2014 | Acura Cars & Trucks

2 Answers

High start up rpm on 2001 jeep grand cherokee


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95 mustang 3.8 has high idle about 3,000 rpm when i disconect the air intake hose from the throtle body idle drops to 800 rpm but is lopey and very rich


Best take it to a repair shop. If your removing air intake ducting and starting the vehicle,you don't understand the technology.

Sep 28, 2010 | 1996 Ford Mustang

2 Answers

RPM run high and slow to drop down


There could be two problems i can think of here. First would be a computer problem. The computer might be telling the car to run at a high speed. A problem like this might be fixable from your local garage. A problem like this could be expensive. Second, as engines age, they natually tend to idle higher. This is a normal occurance. This is accompanied by a decrease of gas mileage. For me, i went from normal 26mpg down to around 22mpg. A problem like this can be fixed by using fuel additives aimed at high mileage cars. I have used fuel injector cleaners, and that has brought my car back to her glorydays of 1996. I hope this helps, if not let me know.

Apr 09, 2010 | 2001 Chevrolet Cavalier

2 Answers

Idler is too high on start-up, goes up to 2.5-3 rpm. and comes back to normal. just started a week ago. what could be the problem? 2005 Chevy Aveo


I bought my 2004 aveo 49 miles. I've had several issues with the car. But recently I been experiencung high idle at start up and clutching. I change IAC. Plugs and wireds. Nothing worked. Today the high idle became constant. It was a metal bubble flex tube near the IAC unit that goes to the exhaust stuff down behind the motor. It apparently was cracked cause today it broke causing the constant high idle sound like a vacumn. We blocked it off with a stick to get the idle back down to 900 rpm instead of 3-4000 rpm took we can get to auto zone for high temp hose per Chevy dealer. I hope this helps someone cause it was fustrating and costly.

Mar 08, 2009 | 2005 Chevrolet Aveo

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