Question about 1998 Buick LeSabre

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Coolant leak The engine coolant is leaking out of the throttle body fresh air intake.

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This engine has a plastic intake, jsut inside of the throttle body is a tube that comes from the EGR. It will burn through the plastic into a coolant passage located inside of the intake. You will need to replace the intake manifold and if you want there is a revised lower intake manifold with a slightly smaller diameter tube to prevent future burn through that will prevent a reoccurance. However, it is a costly repair for what is a infrequent failure. I suggest just replacing the upper intake manifold. They are now available through the aftermarket.

Posted on Aug 20, 2008

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03 trailblazer is hard to start I have to turn the key 15-20 times before it starts. I put in new fuel pump, filter, relays good starter good just hard to start any suggestions on how to fix this issue. ...


You can check the fuel pressure regulator ,
  1. Inspect for a fuel leak from the fuel pressure regulator vacuum port.
Is the fuel pressure regulator leaking fuel ?
This next test needs a scan tool with data reading capability's ,not a code reader ! Are you familiar with OBD 2 ? All the sensors , coolant , O2S , TPS , MAF , Intake air temp. etc. Sensor/System
Monitor the engine coolant temperature (ECT) sensor with the scan tool. Compare the engine coolant temperature with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5 degrees more or less than the ambient air temperature on a cold engine, check for high resistance in the coolant sensor circuit.
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Inspect the PCM grounds for being clean, tight, and in their proper location. Refer to Power and Grounding Component Views in Wiring Systems.


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Inspect vacuum hoses for splits, kinks, and proper connections, as shown on Vehicle Emission Control Information label. Inspect thoroughly for any type of leak or restriction.


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Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking, especially between the mass air flow (MAF) sensor and the throttle body.


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Inspect for air leaks at throttle body mounting area, mass air flow (MAF) sensor and intake manifold sealing surfaces.


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Inspect the wiring harness for poor connections, pinches, cuts, or other damage.


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Inspect for loose, damaged, or missing sensors and/or components.


Really need to check sensor PID'S with a scan tool, An maybe a scope too ! PID'S are parameter identification . All the sensors operate within a set voltage parameter , like the coolant temp. sensor an if it's off it can affect fuel delivery !
This

Mar 15, 2015 | 2003 Chevrolet TrailBlazer

1 Answer

P0508 code on 2001 Honda CR-V how do I troubleshoot


Hello,

P0508 = Idle Air Control System Circuit Low

Symptoms:
Engine Light ON (or Service Engine Soon Warning Light) - Engine hard to start - Rough or erratic idle speed.

Causes:
Dirty throttle body - Electric throttle control actuator misadjusted or damaged - Faulty Electric throttle control actuator - Intake air leak - Poor electrical connection to the Intake Air Control (IAC) valve.

Solution:
If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.


I hope this helps!

Mike

Dec 12, 2011 | 2001 Honda CR-V

2 Answers

My monte carlo has code p0507 what is it and how can i fix it


possible causes
- Dirty throttle body
- Electric throttle control actuator misadjusted or damaged
- Faulty Electric throttle control actuator
- Intake air leak
- Poor electrical connection to the Intake Air Control (IAC) valve
solution !!!
If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.

Jan 28, 2011 | 2000 Chevrolet Monte Carlo

3 Answers

There is smoke coming from under the manifold area i can't see any visible leaks but i have noticed there is a nasty smell of antifreeze as well. The low coolant light is on but there is enough coolant in...


have your cooling system pressure tested, that should give a place to start as to where the leak is and how much it is going to cost to have the problem fixed

Oct 21, 2010 | 1993 Oldsmobile Cutlass Supreme

1 Answer

When i turn on heater or fan engine revs over 3000 rpm


Idle Air Control Valve Pintle may be bad If you disconnect the IAC and the problem ceases it can point to this being the problem.: Removal & Installation 3.5L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the fuel injector sight shield.
  3. Drain the cooling system.
  4. Remove or disconnect the following:
    • The air cleaner intake duct. Figure of IAC and TPS electrical connectors disconnected. aurora_g1.gif

    • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of cruise control and throttle control cables removed from throttle lever. aurora_g2.gif

    • The cruise control cable and throttle control cable from the throttle body lever.
    • The fuel pressure regulator vacuum hose, positive crankcase ventilation (PCV) hose and the throttle body vacuum port hose.
    • The throttle body coolant hoses.
    • The throttle control cable bracket, leaving the throttle and cruise cables connected.
    • The upper nut holding the throttle body to the intake manifold.
    • The throttle body assembly.
  5. Clean the gasket mating surfaces.
To Install:
  1. Install a new gasket and new studs if necessary.
  2. Install or connect the following:
    • The throttle body assembly.
    • Start the top nut by hand.
    • The throttle body coolant hoses.
    • Position the throttle control cable bracket and hand start the retaining nuts and bolt.
    • Torque the three throttle body retaining nuts to 89 in.lbs. (10 Nm). And the bracket retaining bolt to 115 in.lbs. (13 Nm).
    • The throttle body vacuum port hose, PCV valve hose and the fuel pressure regulator hose.
    • The throttle control and cruise control cables to the throttle body lever.
    • The IAC valve and TP sensor electrical connectors.
    • The air intake duct.
  3. Refill the cooling system.
  4. Install the fuel injector sight shield.
4.0L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Relieve the fuel system pressure.
  3. Remove or disconnect the following:
    • Negative battery cable.
    • The Mass Air Flow (MAF) sensor electrical connector.
    • The air cleaner intake duct.
    • The PCV valve fresh air tube. Figure of cruise control cable removed from throttle cable bracket. aurora_g3.gif

    • The cruise control cable and throttle control cable from the bracket.
    • The cruise control cable and throttle control cable from throttle body lever. Figure of IAC valve and TPS connectors removed. aurora_g4.gif

    • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of fuel lines removed from retainer on throttle cable bracket. aurora_g5.gif

    • The fuel feed and return lines from the retainer on the throttle control cable bracket.
    • The transaxle shift cable clip from the throttle control cable bracket. Figure of throttle body removed from water crossover. aurora_g6.gif

    • The throttle body from the water crossover.
To Install:
NOTE: The Mass Air Flow (MAF) sensor inlet and the outlet of the air cleaner assembly must line up when installed. Misalignment may cause MIL illumination or driveability concerns.
  1. Install or connect the following.
    • The throttle body to the water crossover. Torque the bolts to 106 in.lbs. (12 Nm).
    • The IAC valve and TP sensor electrical connectors.
    • The throttle and cruise control cables to the throttle body lever.
    • The throttle and cruise control cables to the throttle control cable bracket. The transaxle shift cable clip to the throttle control cable bracket.
    • The fuel feed and return line retainer to the throttle control cable bracket.
    • The MAF sensor electrical connector.
    • The air cleaner intake duct clamp. Torque the clamp to 27 in.lbs. (3Nm).
    • The PCV valve fresh air tube.
    • The fuel injector sight shield. Torque the nuts to 20 in.lbs. (2.3 Nm).
  2. Install the negative battery cable.
  3. Pressurize the fuel system and verify no leaks.
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Oct 07, 2010 | 2001 Oldsmobile Alero

1 Answer

My 95 bonneville is losing coolant and getting hot. Could it just be the thermostat?


more info would be needed to accurately assist you. the bonnevilles typically had a 3.8 liter engine that had a liquid cooled throttle body assembly. it was common for the gasket between the throttle boty and upper intake manifold to leak. this leak if left unattended for extended period of time could result in low coolant levels, therby causing it to overheat....any time any vehicle overheats..it is wise to replace the thermostat as it can fail as result of overheating....the throttle body is the first component on engine after the large rubber hose of the air filter housing attaches to the engine

hope this helps

Aug 03, 2010 | 1995 Pontiac Bonneville

1 Answer

Buick wont idle after cold start


It could be lots of things, one worth checking is to make sure the throttle body is not sooted up excessively. If your mass air flow sensor is not in the throttle body make sure the hose to it is connected and not leaking, Also check to make sure the intake or throttle body are not leaking coolant into the intake manifold. It would be something you should be able to spot with a scanner and a cold start, sometimes dirty mass air flow sensors and even coolant temp sensors can cause it as well. Try cold starting it with the coolant sensor and mass airflow unplugged just to see what it does. This will turn on your check engine lamp however.

Mar 19, 2010 | 1991 Buick Park Avenue

2 Answers

Overheating losing fluid around intake manifold,is this a blown head gasket what other possibilities could cause overheating besides radiator and thermostat


The intakes on these are bad to leak,this is most likely the problem,there has to be enough coolant in the system to flow correctly,and no air in the cooling system.

Mar 16, 2010 | 1994 Pontiac Bonneville

1 Answer

Coolant Leak


the thing that revs your engine is the throttle body. which connects to the intake. some throttle body's have coolant running through them, if so its usually a small hose running to it that is bad. if its the intake. which sits all along the middle of the motor then you will need to put intake gaskets on it.if you can send me a picture of the leak then i will see if i can see whats leaking

Jan 06, 2010 | Buick LeSabre Cars & Trucks

2 Answers

I have a 1999 saturn sl1 and when i start it up it revs up and after a minute it calms down, also i have a coolant leak coming from the back side of the engine and i'm not sure if it is a freeze out plug...


A coolant leak usually means a bad head gasket. About the high revving, take off the throttle body and clean it. Also, take out the idle air control and clean only the tip and clean the idle air passage with a test tube brush. Before you remove the throttle body, buy a new gasket.

Jul 24, 2009 | Saturn SL1 Cars & Trucks

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