I have a 1998 Isuzu Rodeo with 101,000 miles. There is a loud hiss or whine in the engine when I first start the car in the mornings. The sound goes diminishes as the engine warms up. The sound completely goes away once the engine is warm. I notice a decrease in acceleration performance and perhaps a hesitation in the transmission (no hard shifting) if I drive the car before the sound goes away. Any ideas? Thank you! Frank

start it with a/c off does it still make the noise I have had a few compressor clutch's do this

Frank, I've seen bad intake manifold gaskets on these engines hiss/hum/screech like that until the engine warms up. Might be something to look at. G/luck
Joel

Thanks for the reply. The same high hiss is present when I start the engine with the a/c in the off position. Actually, I don't think I've ever started the engine with the a/c on.

Thanks! I suppose I'll need to take the Rodeo in to the dealership (which I hate doing because of the outrageous cost) in the next couple of days. I'll mention the intake manifold gaskets. Thank you very much. Frank

Frank, did you find out anything from the dealer. I have the same problem in my 97 Rodeo . thanks Jay

Hi I just dropped my 98 rodeo off at the dealership service dept.
The intake manifold gasket is gone again,the second time in 2 years!!!I had the same trouble you were talking about but my truck stalled every time I went from drive to park.
kwjr (kevin)

How much do they charge for this job, and is it a problem in the 1997 3.2L V6.

I don,t know if it is the same problem with 97 3.2L,but the last time I had to pay $200.00. Its not bad but I think for it to happen again,almost 2 years to the day is crazy. I should be hearing from the dealer today with the price this time.
I am also going to call Isuzu Corporate and try to get them to pay the bill this time around. I know of other Isuzu owners who have had the same trouble with the 3.2L and that Izusu knows there is a problem with the gaskets but will not issue a recall to remedy the problem.
Maybe if enough Isuzu owners who have this problem call and complain,They might just do something about it!!
kwjr