Question about Oldsmobile Calais

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Failed emmission test, idle over double allowed, one mechanic said leaking fuel injection another said possible vacuum leakage 1990 olds calais 2.3 L

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  • hansenall Jan 31, 2010

    no check engine lights on, idle seems to surge and go back down every few seconds but stays on the high end even when it goes back down

  • Roger Miller May 11, 2010

    is your check engine light on?

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  • Master
  • 714 Answers

Yes sounds like a vacumn leak or your (TPS) throttle position sensor, iac idle air control

Posted on Jan 31, 2010

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1 Answer

Smog test: fuel evaporative controls functional...failed


Your mechanic will know. Eva= evap system, usually a vacuum leak somewhere. Vacuum leaks will also affect idle.

Jul 08, 2015 | 1992 Isuzu Rodeo

Tip

Bad fuel economy and lumpy idling - possibly causes


<p><b><u><span>Excessive fuel consumption and 'lumpy' idling engine</span></u></b><br /> <p><b><span>Possible faults:-</span></b><br /> <p><b><u><br /></u></b><br /> <p><b><u><span>Coolant sensor </span></u></b><span><span> </span>- engine is signaled as being 'cold' all the time, not just at start up, causing ECU to set longer injection cycle </span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Low coolant level can prevent sensor being able to detect coolant temperature</span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Faulty 'open' thermostat allows coolant to circulate without regulation and perhaps prevents the engine from achieving normal running temperatures.</span><br /> <p><span> </span><br /> <p><b><u><span>FPR</span></u></b><span> - broken diaphragm allows fuel to enter the vacuum line and then into the inlet manifold. Additional source of fuel makes the fuel air mix richer causing a faster and lumpy idle.</span><br /> <p><span> </span><br /> <p><b><u><span>Vacuum leak </span></u></b><span>- 'high oxygen' signal from O2 sensor causes ECU to set longer injection cycle.</span><br /> <p><span> </span><br /> <p><b><u><span>O2 sensor</span></u></b><span> - 'high oxygen' sensor error causes ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br /> <p><b><u><span>MAF</span></u></b><span> - 'over reads' in error the amount of air entering causing ECU to set longer fuel injection cycle </span><br /> <p><span> </span><br /> <p><b><u><span>IAT</span></u></b><span> - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

What is Pc171 Code


It's P0171 & P0174 not Pc 171 & Pc174 ! The engine computer has detected a lean condition ! That mean's it's not getting enough fuel or has a vacuum leak , bad O2 sensor ! fuel pump getting weak . fuel pressure regulator weak !
P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. Air Measurement System
  • MAF sensor (contaminated, damaged, malfunctioning, etc.)
Fuel System
  • Fuel pressure regulator (leaking, malfunctioning, etc.).
  • Fuel filter plugged, dirty.
  • Fuel pump (weak, check valve leaking, etc.).
  • Leaking/contaminated fuel injectors.
  • Low fuel pressure or running out of fuel.
  • EVAP canister purge valve leaking (when canister is "clean").
  • Fuel supply line restricted.
  • Fuel rail pressure sensor (incorrect reading).
Air Induction System
  • Air leaks after the MAF.
  • Vacuum Leaks.
  • PCV system (leak, valve stuck open, etc.)
  • Improperly seated engine oil dipstick.
Exhaust System
  • Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets, etc.).
EGR System
  • EGR valve tube/gasket leak
  • EVR solenoid vacuum leak
Secondary Air Injection
  • Damaged/malfunctioning secondary air injection system (mechanically stuck valve).
  • P0174 - System to Lean (Bank 2) The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. See Possible Causes for DTC P0171. See Diagnostic Aides for DTC P0171
View Freeze Frame Data to determine operating conditions when DTC was set. Observe LONGFT1 and 2 PID(s). Refer to Section 2 , Adaptive Fuel DTCs Diagnostic Techniques for more information.

Feb 12, 2015 | 2002 Ford Escape

1 Answer

Idle needs resetting. emmissions told me my rpm is to high but i do not know how to do myself since engine is fuel injected. the year is a 1992 and engine is a v-8 305


if the idle is to high then you have a defective part in the automatic idle speed control system or a leaking intake manifold gasket or a vacuum hose leaking, idle speed is not adjustable.

Jun 01, 2010 | Chevrolet Caprice Classic Cars & Trucks

2 Answers

Bank1and 2 burn to rich. what would it be


to much fuel pressure is the likely cause, have the fuel pressure checked, should be 42-44 PSI at idle.

May 17, 2010 | 1989 Ford F 150

1 Answer

I have a 1990 Ford F150 with a 302. the truck has


Possible Vaccum leakage. Check the mounting bolts/nuts at the carburetor/throtle body and intake manifold for tighteness.
1 Make sure all vacuum hoses are in place and in good condition.
2. Cracked distributor cap or possible moisture in it.
3. Check spark plugs
4. Perform fuel pressure test
5. Check your coil and ignition system
6. Pluged PCV valve or leaking EGT valve.

Feb 22, 2010 | 1990 Ford F150

1 Answer

Sound like it want to die


I'ts normal on old trucks. But without further analysis i can only refer these problems.1 Your air fuel mixture is either lean or too rich. usually and o2 or Oxygen sensory problem.it causes a starved engine failure or what you described.
2. you have a possible vacuum leak
3. your egr valve has broken seal or gap
4. you dont have constant power like (spark, fuel or alternator/battery)
been doing mechanics for 10 years. So safe to say im close or on the dot!

Feb 16, 2009 | 1990 Ford F150

1 Answer

90 chevy 5.7L k1500 failed emissions


COULD BE A VACUUM LEAK TAKE PROPANE TORCH AND LEAVE OFF PUT AROUND ALL VACUUM POINT WHERE YOU SUSPECT COULD POSSIBLY LEAK ENGINE SPEEDS UP THAT'S IT WORTH A SHOT BEFORE SPENDING MORE CASH

Nov 24, 2008 | 1990 Chevrolet K1500

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