Last post on Nov 16, 2013 at 8:34 AM
You are in the Mazda 626
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Mazda 626, Sedan
#1722 of 2547 1998 626 5spd 83K Miles - sucking sound coming from engine
Jun 11, 2005 (11:29 am)
I never noticed the problem since I bought the vehicle a year ago, but I just got an oil change and the mechanic told me the engine was making a sucking sound that might indicate a cracked intake manifold. (This place doesn't fix that sort of thing, though) I opened the hood and heard it for myself, and it certainly isn't a healthy sound to me.
From what I've read on this board, this seems to make sense, since this car sometimes stalls when idling, but only when the engine's hot.
When it comes to cars I know very little. What I need to know: Is this a serious problem; should I get it fixed immediately? Also, what should I be expecting to pay for this repair? (Feel free to throw out estimates based on total guesses of what the problem might be.)
So far this car has performed wonderfully, save for a radiator leak over the winter and a strange clicking sound coming from the front wheels when I make a really tight turn (my last car, a mazda 323 did that as well, and it always worried me, but never seemed to be a problem).
#1723 of 2547 Re: 1998 626 5spd 83K Miles - sucking sound coming from engine [hercynium]
by MrShift@Edmunds HOST
Jun 11, 2005 (11:31 am)
It's rather odd for an INTAKE manifold to crack....exhaust manifolds are much more likely to do so.
If you have a vacuum leak, sure, that's serious---you could burn your valves by screwing up your fuel mixture and driving your little engine computer crazy. But most vacuum leaks aren't that hard to fix unless the intake manifold is WARPED...and even then you can often take them off and have them machined flat again.
#1724 of 2547 Re: sputtering [mazda_man]
Jun 11, 2005 (4:34 pm)
i got my car looked at today and wanted to let you know what i found out....he ran the diagnostic, i'm not positive how to explain this, but basically, he said that the problem had not been occurring to long, so the problem had not been set officially in the system that the test reads.....the important part is this: one of the spark plugs had a crack in it and the spark plug wires were put on a little backwards...he said both of these things would cause the problems i'm having....he was not thrilled with the brand of wires that was put on it, he prefers a brand that of course, i can't remember! he did say that the oxygen censor shouldn't cause the problems that i'm having....basically, it's fine now, told me to watch it...only $100, it could have been worse! good luck! maybe you should change your plugs!
#1725 of 2547 Re: SOS: Why the HOLD light keep flashing? [kevinzhu]
Jun 12, 2005 (8:41 pm)
I HAD THE SAME PROBLEM YOU HAve to replace the vehicle speed sensor
#1726 of 2547 Re: 1998 626 5spd 83K Miles - sucking sound coming from engine [Mr_Shiftright]
Jun 13, 2005 (7:22 am)
I also have a 98 626 5-speed V6, with almost 209,000miles mind you, and it just started to make this sucking sound as well. There are many things that could cause a sucking sound, but my problem, like Mr_Shiftright mentioned, is the exhaust manifold. You can visually check this (don't know if you have the 4cyl or if it's different) - under the front of the car in the very center just behind the rad you will see the exhaust manifold (attaches to the front of the engine). The mid line of the pipe tends to rust, and eventually small holes or cracks will form. Don't know how much to fix, I'm trying to get rid of this car as I bought a 2002 626 ES. I would also check the air intake, not the manifold, but where the air filter is and the hose leading from the filter to the throttle body for cracks. The filter housing is sometimes hard to install over the rubber filter frame, and it is possible the housing is leaking.
#1727 of 2547 Re: 1998 626 5spd 83K Miles - sucking sound coming from engine [amzeus]
Jun 15, 2005 (7:38 am)
Thanks for the advice, both of you. Of course, I'm not taking the advice of the jiffy-lube guy as a certain diagnosis, but I'm glad he pointed out the problem. I just might try looking for holes in the exhaust manifold pipe. Also... can you describe where the filter housing is, and how I would check?
I'm just trying to get an idea of what the problem is so I don't get fleeced. I'm just nervous since I moved too far away to take my car to my old mechanic... he's slow, but he's honest, frugal, and always does the job right.
#1728 of 2547 Re: sputtering [carhelp101]
Jun 15, 2005 (11:37 am)
thanks for the advice but i already changed the plugs and the wires and the fuel filter and the cadalac convertor,and the air intake hose bc it was crack and it is still doing it just as bad,sometimes it acts like it doesn't even want to goi went to get it put on a test but my uncles was haveing some problem so i should get it done by tomorrow,i just hope it is nothing to serious
#1729 of 2547 A/C Evaporator Core/Expansion Valve 1996 626LX V6
Jun 15, 2005 (12:34 pm)
I hope someone can help me here, you all seem to really know a lot about Mazda's.
The problem is the A/C, it worked ok last year, but this summer it's blowing hot air. I put some more r-134 in it and it worked somewhat for a day, then back to hot air the next. The mechanic who checked it said he was 85% sure it was the Expansion valve on the Evaporator core. The entire core with new valve is only $250, but labor is $800! I want to replace the valve or core myself, but I'm not sure how to do it. I got the Hayne's manual and it doesn't look too difficult. Any suggestions?
Also, could it be a problem other than the expansion valve or evap. core?
#1730 of 2547 Re: A/C Evaporator Core/Expansion Valve 1996 626LX V6 [bwade1]
by MrShift@Edmunds HOST
Jun 15, 2005 (3:28 pm)
Why do you have to replace the entire evaporator? Putting in a new expansion valve isn't usually too hard (just a couple of wrenches, really) but you don't have the equipment to evacuate and clean the system. You'll probably want to put a new drier in there too since you're opening everything up.
#1731 of 2547 Re: A/C Evaporator Core/Expansion Valve 1996 626LX V6 [Mr_Shiftright]
Jun 16, 2005 (9:13 am)
The mechanic was just recommending replacing the evaporator since I was already paying him to get at the expansion valve. But, since the valve is only $30 or so, and the dryer is about $60, I think I'll try those first instead.
Do you have any idea how much it would cost to have a mechanic evacuate and clean the system before I do the work?
btw...thanks for the input...I really appreciate it.