Question about Chevrolet C3500

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1999 chevy cube van 454 rolling idle bad tried egr,intake gaskets exhaust fuel trims driving are within specs but at idle veh hunts up/down badly cannot figure out veh has 155000

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Have you cleaned or checked the mass air sensor?

Posted on Apr 24, 2009

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Rough idle chevy 350


Have you checked/replaced the O2 sensor(s). They produce the data that your computer reads. Bad/clogged O2 sensors will trick the ECU into running lean/rich.

Aug 23, 2014 | 1990 Chevrolet C1500

1 Answer

1997 mercury cougar xr7, egr valve exhaust tube became loose followed by air leakage and lost of engine power, I tightened the exhaust tube but the loss of engine power still remains.. I tap on the gas,...


Have to replace egr gaskets that burn away or tubes that rust out

What you have is exhaust system leaks & a lack of fuel control or
fuel trim, where the oxygen sensors are saying one thing and the cars computer doesn't know about the unmetered air getting in after
the maf sensor,thus the poor perfromance

You can not have ANY vacuum leaks-- evap system,intake,exhaust,
you get the idea

Try removing & capping the vacuum hoses to egr
The egr valve may be bad

Replace any oxygen sensors over 100,000,miles
Replace spark plugs in motor over 3 years
Clean Maf Sensor (crc maf cleaner)

Jul 16, 2014 | Cars & Trucks

4 Answers

My car sounds like a airplane when it idles up


-Possible broken exhaust gasket. depend on where the sounds came from...?

Good luck


Mai

May 20, 2014 | 2001 Ford Focus

1 Answer

Idle up down


hunting or surging ilde. name the 2 RPMS, low and high , is it hot or cold engine this issue.? 400rpm or 1000 or 2000 all are diff.causes.
no year, stated. so cant help.
but ill answer in the generic,
1: the ECU (got a carb,? )
the ecu controls idle speed at all times.
if not , there is a problem (you)
A: air leaks in the induction will make motor race at some point the ECU/ISC loses control. and hunts. trying hard to correct it.
b: egr stuck open idle too low, iSC cant correct it,, bad EGR.
c: engine EFI running way too leak starving for fuel so it hunts for 2 reasons < ISC hunting, and lean does that.
lean is gross power loss and opening throttle bogs the engine.
so is double bad. ISC makes it worse,

all this breaks down to 2 reasons.
1: ISC bad. in some way (gummed up. or restricted inside)
2: bad fueling or air leaks. vacuum leaks.

try answers , the hot cold question and the 2 speeds, of the hunt.
lowest rpm and highest of the hunted range of RPM.

Nov 23, 2013 | Honda Civic Cars & Trucks

1 Answer

1999 chevy malibu 3.1 rough idle only win car is in park not as bad win its in drive did a full tune up no check engine light on 0 codes has lots of power I just don't it i check for vacun leaks none...


clean your iac (idle air control) and then replace ignition plug wires and clean off terminals on coils before putting new wires on, use scotch brite pad or equivelent. could also be intake gaskets leaking, did you notice 1 or more spark plugs cleaner than the others when changing them, sign of burning coolant

Feb 08, 2012 | 1999 Chevrolet Malibu

2 Answers

Po304


P0304 Code indicates a misfire on cylinder 4
Most likely causes for this are bad wire, bad spark plug, bad coil(s) or bad dist cap if so equiped.
A vacuum leak can also cause a misfire.
Seeing the vehicle is going on 13 years old replacing the wires and the plugs would be a good place to start, and could be the solution

May 16, 2011 | 1999 Chrysler Town & Country

1 Answer

EGR VALVE 1999 MERCURY COUGER


SECTION 303-08: Engine Emission Control 1999 Cougar Workshop Manual REMOVAL AND INSTALLATION Exhaust Gas Recirculation (EGR) Valve Removal
  1. Remove the air cleaner outlet tube.
    1. Disconnect the intake air bypass hose.
    1. Disconnect the positive crankcase ventilation hoses.
    1. Remove the air cleaner outlet tube.
  1. Disconnect the tube from the exhaust gas recirculation valve.
  1. Remove the exhaust gas recirculation valve.
    • Disconnect the vacuum hose.
Installation
  1. sxu~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: When cleaning the gasket faces, do not allow debris to enter the intake manifold or exhaust gas recirculation valve.
    Clean the gasket faces of the intake manifold and exhaust gas recirculation valve.
  1. Install a new exhaust gas recirculation valve gasket.
  1. Position the EGR valve and install the bolts.
    • Install the vacuum hose.
  1. Connect the EGR tube.
  1. Install the idle air control valve. For additional information, refer to Section 303-14A . For additional information, refer to Section 303-14B .

Sep 15, 2009 | 1999 Mercury Cougar

1 Answer

Van stalls after it is started and put in drive what can this be?


it could be bad plugs.stop up fuel filter.egr valve intake gasket leak or the idle speed control not working.

Jul 10, 2009 | 1999 Ford Windstar

1 Answer

Clicking noise when accelerating


It's hard to diagnose with just the small information you have stated, but it 'sounds' like it's that Exhaust Gas Recirculation Valve gasket.

In your cylinder head is a runner that brings exhaust gas up through the intake manifold.
The EGR valve is attached to the intake manifold, and the sensory part of the EGR valve sits down in the pathway of the runner.

A bad EGR valve gasket will let exhaust gasses escape, making the sound you described.

Apr 20, 2009 | Dodge Neon Cars & Trucks

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