Question about 2002 GMC Envoy

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What controls rpm? - 2002 GMC Envoy

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Engine speed there is a sencor in the transmission that sends a signal to the gage

Posted on Oct 29, 2012

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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.

May 31, 2016 | Isuzu Cars & Trucks

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Code p0506 on a 03 grandmarquis battery light comes on and stalls.


Does yours have electronic throttle control ?
P0506 - Idle Air Control System RPM Lower Than Expected (Electronic Throttle Control [ETC] Vehicles) The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.
  • Air intake restriction
  • Exhaust restriction
  • Engine mechanical fault
  • Damaged electronic throttle body (ETB)
  • Damaged PCM
This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present inspect the intake air system for air or vacuum leaks and damage. If no concerns are present, clear the DTC and retest. P0506 - Idle Air Control System RPM Lower Than Expected (All Others) The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.
  • IAC circuit shorted to PWR
  • VPWR to IAC solenoid open
  • IAC circuit open
  • Damaged IAC valve
  • Damaged PCM
  • Air inlet is plugged
The IAC solenoid resistance is from 6 to 13 ohms. Monitor IAC PID duty cycle and/or voltage.

Jun 21, 2015 | Cars & Trucks

1 Answer

I have a 1995 suzuki sidekick that is revving hi then low while in nuetral also when driving now it revvs up very high while sitting at a stoplight


at what RPM?,sure the 2wd has no tachometer,

Sidekick, with what engine? sure 5speed and 2wd,
but what engine.?
in 1995 they (last year this) 2 engines
the 8v and 16valve,
both, night and day different, EFI.
TBI and MPI injected, 8v is black top, 16v says 16 valves on top.
but both engines, will fail ISC controls like that if there are problems.(idle speed controls)
the surging (hunting) is one of 2 things.
  1. (too lean, or air leaks)
  2. or ISC lost control)
the ECU on the car will in fact hunt the ISC if it can not attain
800 RPM hot IDLE, that is its JOB, to do that, endlessly.
in fact 200 times a second.!
but is not working. (this control, its out of control for sure)
to find this can be easy or hard.? (luck and true causes)
depends on true cause.
I cant do both engines here, be like 10 pages.
The 8v engine races with all air leaks. and hunts. (races)
the 16v goes lean with all air leaks, (air density system is unique)
and goes slower, RPM and may hunt. no RPM stated so cant wax smarter...sorry.

so its a dirty ISC? cant close fully, ? clean it? first.
the 8v has air leaks. caused by vast reasons.
cracked hoses. leaking diaphragms, even the brake booster can leak. lots of leakage patch possible
or some one fiddled the idle air bleed screw making it fail.
try closing that valve (screw) turn it CW directly clock wise.

this page covers both systems.

http://www.fixkick.com/fresh-air/idle-air-supply.html


this ISC cleans just like the EGR that leaks.
egr leaking cause, low RPm and it too, can make the ISC go nuts.
so, but no RPM stated. so.....
eg: hunting from 1000 to 1500RPM
or hunting from 500 to 700 rpm?

i pinch all hoses first.
if RPM drops the hose is cracked or the other end is leaking air.
every 50k miles?

http://www.fixkick.com/sensors/cleaning-egr-isc/double-trouble1w.JPG

does RPM go below 800 RPM HOT engine?
yes ./no
this a is key factor.

Feb 28, 2015 | 1995 Suzuki Sidekick

1 Answer

Transmission surge at cruise


check the rpm and road speed when this happens . The cruise control will increase to keep RPM constant but as the road speed drops the auto may be shifting down and as the rpm increase it shifts back before the rpm adjusts. You can override a cruise control in this situation by simply pressing down on the accelerator to maintain the power setting and road speed and when the situation is passed and you take your foot of the accelerator the cruise control will return the system to the set position without you needing to do anything

Nov 25, 2013 | Dodge Ram 1500 Cars & Trucks

1 Answer

Loud idle running hot in park but not in drive


double posted
post RPM in both modes,
it must be the same
the ISC idle controls system controls idle at all times.
post RPM. 800 is normal. the exact valve is in the FSM
and posted under the hood in USA.
no country stated in 4000s posts so.... well, gee....
here, open the hood, look up, see EPA vacuum map
that is also the the engine size and type , and most state the normal
hot RPM clearly there, and is in the FSM.

here is the acid test. hot.
in park hot, rpm 800 if not the ISC fuction is dead
"idle speed controls"
good? yes.
then select drive. if RPM drops ISC is malfing.
now back to park. (all this is in the FSM to read)
now 800 hot. you turn on all heavy electrical loads
the rpm does not drop. Head lights + heater fan, and defrost.
all these test he ISC, if it fails its bad.
what does bad mean, that means its out of control
and you do further testing to find the reasons.

vast reasons.
Ill name 3:
intake air leaks. aka vacuum leaks.
ISC valve dirty , clean it.
throttle cables , misadjusted.
cold start air valve stuck open hot.





Nov 25, 2013 | 2006 Jeep Grand Cherokee

1 Answer

Loud idle running hot


loud,
my guess, wild, is its not noise, (rattling or banging etc)
its just too high RPM ?
HOt.
the RPM is 800 RPM ,if not?idle controls are out of control

Nov 25, 2013 | 2006 Jeep Grand Cherokee

1 Answer

I have a 2008 mercury Milan with nearly 60k miles on it. When I come to a stop the rpm drops by 1000 then recovers quickly. What should I do to fix the problem? Any suggestions will be greatly appreciated.


Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode? http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
---------Mitsubishi Lancer rpm needle bounces? http://technoanswers.blogspot.in/2012/02/mitsubishi-lancer-rpm-needle-bounces.html
--------How to adjust rpm on 2009 dodge charger SRT8?


http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

---------

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

---------
High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-----------
Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

--------
Fuel Injection Problem And RPM suddenly increases http://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

----------
2005 Toyota Highlander: Engine runs hard RPM below 3000? http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

---------
1987 Toyota Camry: RPM Drops going Up hills? http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

-----------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

----------
1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?


http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

------------
1999 Toyota Camry: Erratic stalling and high engine RPM at idle?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

---------
1995 Toyota LS: Misfire at idle or low RPM http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM? http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

----------
These will help.
Thanks.

Nov 22, 2012 | Cars & Trucks

1 Answer

Driving on the road the RPM goes higher wituout speedind


Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode?http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
---------Mitsubishi Lancer rpm needle bounces?http://technoanswers.blogspot.in/2012/02/mitsubishi-lancer-rpm-needle-bounces.html
--------How to adjust rpm on 2009 dodge charger SRT8?


http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

---------

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

---------
High rpm in neutral? Inconsistant high RPM in neutral?http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-----------
Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

--------
Fuel Injection Problem And RPM suddenly increaseshttp://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

----------
2005 Toyota Highlander: Engine runs hard RPM below 3000?http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

---------
1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

-----------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

----------
1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?


http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

------------
1999 Toyota Camry: Erratic stalling and high engine RPM at idle?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

---------
1995 Toyota LS: Misfire at idle or low RPMhttp://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM?http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

----------
These will help.
Thanks.

Nov 22, 2012 | 2008 Toyota Avalon

1 Answer

My RPM is always at 3000


it sounds like you have a stuck IAC, Idle Air Control Valve. It meters air in when the throttle plate is colosed (foot off gas).

Autozone can scan for fault codes for free.

May just need cleaning. Try that first.

Idle Air Control (IAC) Valve —2.0L SPI Removal
  1. Disconnect the idle air control (IAC) valve electrical connector (air cleaner outlet tube removed for clarity).
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  1. Remove the IAC valve.
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  1. Remove and discard the IAC valve gasket.

May 18, 2009 | 2000 Ford Focus

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