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View Full Version : Engine Help Car trouble - Metal grinding or air hissing like noise with lose of power



Ryan S.
06-26-2015, 09:15 PM
My car is making fine, sort of high pitch metal grinding or air hissing like noise at idle and at low RPM. At the same time, engine is vibrating and experiencing a lose of power at the start or low speed. Once I get up to 30mph, car behaves almost like normal. But as soon as I slow down, I can hear the noise and car starts to vibrate moderately.

I drove this car to work this morning and drove back home without any issues (25ml round trip). Outdoor temp was at 100F today. Parked car for about 30 min at home and I drove to a shopping mall, 5 miles away. Parked car for about 30 min and came out from the store. When I tried to start the car, I started having hot start like problem and car wouldn't start. After several tries, car started finally but I'm start hearing hissing noises and vibration. I stopped and checked engine but couldn't see anything out of ordinary. Belts are all fine. Fluids are all ok. AC worked fine. Drove with AC off but didn't make any differences.

Only thing that I did differently was to test my heater today. I wanted to see if turning on heater would reduce engine temp or not. Otherwise, car was working fine and I have been driving it to work and back home since Monday. My guess is something wrong with fuel system. Difficulty w starting and lose of power. But I'm just not sure about this strange noise.

Here is the video that I took at the parking lot. Appreciate any suggestions and recommendations. Thank you


https://youtu.be/Wg98spOjlAY

Ryan S.
06-26-2015, 09:36 PM
I think I found the cause. A vacuum hose from spark advance to solenoid was disconnected. Once I reconnected, the noise and lose of power disappeared. But vibration remained. At idle, it still vibrates with AC on. If I turn off AC then vibration diminishes. This car never vibrated like this with or without AC so I am not sure what is going on.

http://dmctalk.org/attachment.php?attachmentid=35184&stc=1

Ryan S.
06-27-2015, 12:31 PM
As I suspected, it was fuel system related. For some reason, #4 injector was popped out. As soon as put it back in, vibration stopped. I guess 100F temp was too much for my car yesterday. I will spend this weekend go through other hoses and lines and make sure they are all in place securely.
:smile:

Rich
06-27-2015, 02:59 PM
Hi Ryan, glad you got it all going again.

Good idea to do a further check like you say.

Will guess those red hoses are silicone - you probably know they are kind of slippery relative to the OE rubber ones and can slide off more easily depending on the fit and whether they are clamped or not.

As for the injector popping out it could happen if you get a backfire condition (pressure pulse in the intake) - the same thing could have helped the solenoid hose pop. Any backfires yesterday on your hot drive or the restart?

-Rich

Ryan S.
06-27-2015, 06:32 PM
Hi Rich, Thanks for your comments
No back fire. Car has been running fine since DMCCA. But I will keep my ears open.
Yes, those red silicons are pretty slippery. I have to add some clamps to keep them there.
I guess I won't be using my car for awhile. It's gonna be 100+F all next week here. Wednesday will be 108F here in Sacramento. I get really nervous when temp guage hits 220.

Bitsyncmaster
06-27-2015, 07:19 PM
You should not need clamps on vacuum hoses. If they are loose then your hose ID is to large. Exception would be the large heater type hoses on the idle motor but even those seem to hold without clamps.

David T
06-27-2015, 07:39 PM
As I suspected, it was fuel system related. For some reason, #4 injector was popped out. As soon as put it back in, vibration stopped. I guess 100F temp was too much for my car yesterday. I will spend this weekend go through other hoses and lines and make sure they are all in place securely.
:smile:

Reasons:
Old, hard injector seals
Missing/broken clips
Mucking around and disturbing things
Backfire

Ryan S.
06-28-2015, 03:43 PM
Answer might be
Mucking around and disturbing things:wrenchin:
I need to stop messing around with this car....

DavidProehl
06-29-2015, 09:46 AM
Glad you figured this out! Yes, the temps lately have been a bit warm here. This 100+ weather can be tough on a car.