Last post on Nov 16, 2013 at 8:34 AM
You are in the Mazda 626
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Mazda 626, Sedan
#2061 of 2547 possible causes of a bad Fuel Pressure Regulator?
May 23, 2006 (12:56 pm)
Hi. I've been having problems with my 2001 4cyl mazda 626 not starting in warm weather.
The Fuel Pressure Regulator keeps going bad. I've replaced it twice in two years. There is something else in the car causing the regulator to become faulty, and causing other problems with the vehicle.
Can anyone please tell me what components in the vehicle could possible do damage to the Fuel Pressure Regulator if they are faulty themself? Would the fuel pump relay have an effect? the fuel pump itself? the main computer brain? the fuel injectors?
I'm just trying to get an idea of all the possible causes of repeated fuel pressure regulator failure. thank you.
#2062 of 2547 1997 626 - engine heats up within minutes and shuts off - URGENT HELP!
May 23, 2006 (6:48 pm)
I bought a second hand 1997 Mazda 626 V4 automatic 3 weeks back with 93K miles on it. The engine was doing fine until last week when the engine started to heat up all of a sudden and stopped in the middle of the road. I got it towed to the nearest Mazda dealer. He took a week to diagonize and told me that the compressor is bad and would cost a lot to repair it. So he suggested on changing the engine itself for $2600($900 engine[85K miles] + $1700 labor). Before this problem there was a lot of vibration in the engine during drive (D) and would come down a bit when in N or P. I do not know the cause for that! Can this be one of the reasons for the engine to heat fast and stop abruptly? Is there any other reason for the engine to heat up so fast and stall? Should I get the engine replaced or take it to any other local mechanic? I am student and can't afford to spend a lot on the car right now. Can anyone suggest what needs to be done?
Any replies will be greatly appreciated.
#2063 of 2547 Re: 1997 626 - engine heats up within minutes and shuts off - URGENT HELP! [veerent]
by MrShift@Edmunds HOST
May 24, 2006 (10:05 am)
I don't see the connection between a bad compressor and the overheating. I'd hook it out of there and get a second opinion or get some kind of credible explanation from the dealer. Is the engine damaged or not? How does the dealer KNOW the engine is damaged, that is, what quantifiable evidence is he presenting?
Overheating needs to be carefully diagnosed, as there are many reasons this can occur.
If you can't get any straight, solid answers, get the car out of there.
#2064 of 2547 Re: 1997 626 - engine heats up within minutes and shuts off - URGENT HELP! [Mr_Shiftright]
May 24, 2006 (10:31 am)
Well, actually I had posted it wrong. Sorry!
The dealer told me that the engine has "bad compression" or "low compression". The head and the head gasket are OK. But since the compression is low, he will have to change the engine. Is it a good idea to get it done from a dealer or a private mechanic? The dealer is quoting US $2600.
Any idea's how much does the engine for a 1997 Mazda 626 I4 automatic (2.0L, I think) cost?
#2065 of 2547 Re: 1997 626 - engine heats up within minutes and shuts off - URGENT HELP! [veerent]
by MrShift@Edmunds HOST
May 24, 2006 (3:33 pm)
I still don't think you are getting enough information from the dealer, upon which to make an intelligent decision.
What you need is results of a cylinder leakdown test to determine the cause of the low compression. This can be pinpointed exactly. Either bad valves, warped head, bad rings????
#2066 of 2547 Re: Engine vibration [Mr_Shiftright]
May 26, 2006 (4:34 pm)
Well, good news--sort of. No problems with the engine mounts. The engine vibration is caused by some sort of vacuum leak, according to the shop. They weren't able to pinpoint it before they closed for the weekend, so I will bring it back next week. They think it could have been caused by the accident (pinched/damaged hose maybe) but are not sure. If it's accident related my insurance company will cover it.
#2067 of 2547 Re: 1997 626 - engine heats up within minutes and shuts off - URGENT HELP! [Mr_Shiftright]
May 26, 2006 (9:37 pm)
Thank you for your help/reply.
Good news...The mechanic said, he has stopped the engine from overheating. He had to change the water hose for this. But he also told me that the compression is low/bad. He wants me to change the engine as soon as possible.
1) Can I drive my car with a low/bad compression? If so, for how long?
2) How will the low/bad compression effect the engine?
3) What must the ideal compression be for a 1997 626 Mazda I4 automatic?
4) Is the compression a serious problem?
He told me that the head and head gasket are OK.
Is there a site where I can read more about all this stuff?
All the info that I have posted so far is from the mechanic.
#2068 of 2547 Re: 1997 626 - engine heats up within minutes and shuts off - URGENT HELP! [veerent]
by MrShift@Edmunds HOST
May 27, 2006 (9:49 am)
Well you need about a minimum of at least 85 lbs of compression in a cylinder to fire it, so sure, you can run with LOW compression but not with TOO LOW compression, or the cylinder or cylinders below about 85 lbs won't fire. You don't want to drive with cylinders misfiring...not only will the car be incredibly slow but you'll ruin your catalytic converter, which will be overwhelmed trying to burn raw gas.
Here's a good explanation:
#2069 of 2547 Any hidden damage to look for after accident?...
May 29, 2006 (11:12 am)
I've got a '99 626 6cyl with 114K miles on it and it's been running pretty good. I recently had an accident though. Another car misjudged and made a left turn from their opposite lane of traffic too soon. I smashed into the side rear of them. I was going about 35mph and both driver and passenger airbags deployed. Most of the impact of my car seems to have been absorbed by the front, passenger side of my car. Aside from that body damage, the car still seems to be running pretty good though. Since the impact was absorbed by the front, I'm not completely sure what, if anything, I should tell the mechanic to double check as far as damage goes. Any advice?
#2070 of 2547 O/D light blinking
May 29, 2006 (8:58 pm)
I just got a '95 626 4 cyl. 92,000 miles, infact driving it on the way home and the O/D light started blinking.. and then I did notice this morning a small spot of transmission fluid under it. I have been reading the forums here and it doenst look good.... does it. Any advice?