Low Vacume problem...
01-09-05, 12:00 AM
#1
Low Vacume problem...
Imagine your car idles fine at 900 RPMs, but pulls 11-10 vacume and this suddenly happened after your car was previously pulling 16 vacume, what happened?
I started my car in a parking lot, vacume and idle were fine, drove on the highway (did not drive the car hard) and then my car still idled fine, but pulls crappy vacume.... andybody have any thought??? please....
I started my car in a parking lot, vacume and idle were fine, drove on the highway (did not drive the car hard) and then my car still idled fine, but pulls crappy vacume.... andybody have any thought??? please....
01-09-05, 06:25 PM
#3
been looking for a knocked off line, I have yet to find one, can anybody else think of another possibility? I have blown a motor before and this does not seem like the symptoms, are the symptoms of a blown motor always the same or can they differ?
01-09-05, 07:30 PM
#4
Senior Member
The symptoms of a blown motor can be different depending on what seal goes out. O-rings don't go out all of a sudden. And if one of your apex seals went out it most likely would have a very rough and lumpy idle. You may need to take off the UIM to check all the lines underneath. Are you having any symptoms other than low vacuum? Strange boost pattern, stuttering, smoke, stalling...any thing like that.
01-09-05, 08:21 PM
#5
it seems to studder a little as I drive the car, but no smoke, no stalling, and I don't know about boost patterns because I did not get into boost after I noticed the problem I just drove the car home and it is still sitting there in my garage
01-10-05, 01:50 PM
#7
Could be one or more of several things:
* blown off vacuum line
* blown gasket
* blown engine
Basically, you won't know until you keep digging. If you think it could be a seal, get a compression test done as that's the only way to know for sure (you already know this).
FYI, when I blew my motor, the car drove fine on the high (and I was actually still on the track running it without a problem as well). In my case, it was a cracked seal, it didn't completely come out. So the car idled a little funny, lower vacuum, but was nice and steady onces the rpms came up a tad from idle.
* blown off vacuum line
* blown gasket
* blown engine
Basically, you won't know until you keep digging. If you think it could be a seal, get a compression test done as that's the only way to know for sure (you already know this).
FYI, when I blew my motor, the car drove fine on the high (and I was actually still on the track running it without a problem as well). In my case, it was a cracked seal, it didn't completely come out. So the car idled a little funny, lower vacuum, but was nice and steady onces the rpms came up a tad from idle.
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01-10-05, 01:55 PM
#8
same problem happened to me when i had my talon, at startup, everything would be fine..i would be on the highway to go to school for like 30 minutes, i get to the parking lot and the idle would go all weird and sometimes it would stall out..
it was the ISC..umm how bout the tps?
it was the ISC..umm how bout the tps?
01-10-05, 05:20 PM
#9
Solved! (but not yet fixed...) my leading ignition wasn't fireing at all!!, I blew a fuse and somehow shorted out my jacobs ignition amp box, idle and vacume came back up after the ignition was routed through just the coil, so I'll be needing a new ignition amp and possibly some new spark plugs... thanks for the help and info you guys I feared the worst for awhile.