Question about 1998 Pontiac Grand Prix

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Just pulled the intake manifold on my BBC and found antifreeze in all of the closed intake valves, what caused that??

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Not sure what engine you are speaking of, (other than BBC) but if you did not drain your cooling system before removing the intake manifold, any coolant in the manifold distribution channels would pour out through the easiest path once the gasket seal was broken.

Posted on Jan 02, 2011

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2004 ford f 150 5.4 3V pulled intake fixed vac hose came off replaced imrc & still show intake runner control closed bank 1 Still has no power when I get in it to pass something any ideas?


Is your check engine light on ? Any codes ?

There are three basic types of intake air sub-systems:


  • Intake Manifold Runner Control (IMRC) electric actuated system

  • Intake Manifold Swirl Control (IMSC) vacuum actuated system

  • Intake Manifold Tuning Valve (IMTV)

These subsystems are used to provide increased intake airflow to improve torque, emissions and performance. The overall quantity of air metered to the engine is controlled by the throttle body.

Intake Manifold Runner Control (IMRC) Electric Actuated System
The Intake Manifold Runner Control (IMRC) Electric Actuated system (Figure 107) consists of a remote mounted motorized actuator with an attaching cable for each housing on each bank. Some applications will use one cable for both banks. The cable or linkage attaches to the housing butterfly plate levers. The 2.0L (2V) Focus IMRC uses a motorized actuator mounted directly to a single housing without the use of a cable. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the butterfly valve plates closed. The motorized actuator houses an internal switch or switches, depending on the application, to provide feedback to the PCM indicating cable and butterfly valve plate position.



Below approximately 3000 rpm, the motorized actuator will not be energized. This will allow the cable to fully extend and the butterfly valve plates to remain closed. Above approximately 3000 rpm, the motorized actuator will be energized. The attaching cable will pull the butterfly valve plates into the open position. Some vehicles will activate the IMRC near 1500 rpm.



WARNING: SUBSTANTIAL OPENING AND CLOSING TORQUE IS APPLIED BY THIS SYSTEM. TO PREVENT INJURY, BE CAREFUL TO KEEP FINGERS AWAY FROM LEVER MECHANISMS WHEN ACTUATED.




  1. The PCM uses the TP sensor and CKP signals to determine activation of the IMRC system. There must be a positive change in voltage from the TP sensor along with the increase in rpm to open the valve plates.




  1. The PCM uses the information from the input signals to control the IMRC motorized actuator based upon rpm and changes in throttle position.




  1. The PCM energizes the actuator to pull the butterfly plates open with the cable(s) or linkage.




  1. The IMRC housing contains butterfly plates to allow increased air flow.

Jun 29, 2015 | Ford Cars & Trucks

1 Answer

I have antifreeze leaking into the throttle body on a 2002 BMW 530i, what should i check for?


EGR valves connect to the intake manifold and are subject to corrosion. Check that this unit is not leaking . have a coolant pressure system check done.
Run fault codes to check if a sensor is leaking.

Feb 03, 2015 | BMW Cars & Trucks

1 Answer

Exaust intake leaking


It's exhaust manifold. There are two manifolds, the intake manifold in the valley between the cylinder heads, and the exhaust manifolds, one on each side of a v figured engine.

And, yes, a leak in the exhaust or the intake will make it run lean. If the leak is close to the engine, it can do harm to the valves, too. There is a gasket between the exhaust manifold and the engine block. Likewise, there is an intake manifold gasket between the intake manifold and the block.

Apr 04, 2014 | 1998 Ford F150 Regular Cab

1 Answer

86 nissan pickup 3.0 5speed 4x4 and i got oil in the water and none visible on the dipstick though,,,i also seem to have lost oil pressure but the light isnt on just low guage and when i got home valves or...


SOUND LIKE INTAKE MANIFOLD LEAK.ANTIFREEZE WILL GET IN CRANK CASE DILUTE ENGINE OIL CAUSE VALVE LIFTER NOISE.TAKE VECHICLE TO RADIATOR SHOP OR GARAGE.LET THEM PRESSURISE COOLANT SYSTEM CHECK FOR INTAKE MANIFOLD LEAK AND HEAD GASKET LEAK.

Dec 10, 2010 | 1986 Nissan Pickup 4WD 1986

1 Answer

01 pontiac gt overheating. if a/c or heater on it


It may be the intake manifold gasket that has gone bad and you may be losing the antifreeze in your engine. Pull the oil dip stick out and see if it' over filled and look under the oil cap, look to see if there is any sign of antifreeze in your engine oil. Under the cap would have a milky brown sludge and under the PVC valve too, if there is then your engine is on it's way out if you do not repair the leak. Antifreeze is corrosive to the engine bearings and it's been know that as low as 1000 miles will cause the engine to go bad with antifreeze in the engine. The intake manifold gasket is known to go bad in the 3.4 liter engines till 2004 where they came up with an upgraded gasket. Good luck and keep me posted.

Nov 03, 2009 | 2000 Pontiac Grand Am GT

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