Search the Community: Showing results for tags 'spark plugs'.
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I have a 1998 4cyl that has really poor acceleration particularly at low RPM's. The problem has progressively gotten worse. It is to the point that the car does not have enough power to start moving from a start if it is even slightly uphill. It feels like the engine just bogs down when you try to get the car start moving. It seems to operate a lot better once you get to 2500-2700 RPM and accelerates fine from a passing gear. The car sometimes is hard to start, but once it starts seems to idle fine, however, it has recently started to idle erratically. If you press firmly on the throttle in park, the engine seems to bog down and sometime dies. The check engine light is not lit. This is what I have tried: checked for codes, only found one for second oxygen sensor which i found to be unplugged Replaced spark plugs Checked coilpack, tests within specs removed catalytic converter and inspected, it is clean not clogged air filter is clean inspected the timing belt and marks lined up oil is good, no antifreeze inspected MAF sensor for debris or dirty, it is clean. Things i havent checked: Fuel pressure any ideas? is this a common problem? any help is greatly appreciated
Hey guys, firstly i would like to thank all you guys who actually respond to these kinds of question and chip in your "two cents" in to it. MUCH OBLIGED! Had two CEL codes. 421, and another one that said something about the purge control. It used to idle really bad in Drive and reverse but it had a pretty decent idle in neutral. Also had horrible idle when the AC was on. i tried pretty much everything i could find on these forums. Here is what i've done so far Check for all vacuum leaks, Replaced: PCV and Both O2 Sensors, took off a purge solenoid off a junkyard. Clean; MAF, Throttle Body, EGR (Replaced the gaskets as well) Flushed the coolant and put new coolant in. Reset the Computer SeaFoamed the car into the brake booster. Spark Plugs have been gaped. (not professionally) And maybe something else that i don't remember at 11pm Another possible problem is i went to a proper mechanic and he said i need a new cat for the back. I think its the one after precat. He said it clogged up and is colder than the one closer to engine by 50F. All of the parts were filthy and now the car works significantly better. Better acceleration and the car struggles less, however, still had pretty rough idle and the rpms dropped sometimes when car was warm. the first time i cleaned out the AIC i had to give it a little bit of gas to get the car going but then it worked ok but still idled pretty low at around 500 or so. Today i flushed the coolant and remembered i didn't do the AIC Properly (i took apart the spring and didn't put it back so it was snug in there.) So i took off the AIC put the spring in it so it is snug, (took of the negative terminal on the batter and pressed brake 40 seconds to reset computer) Now i have to give the car gas so it starts everytime. The car has incredibly low idle at around 500, at this point power steering isn't doing its job either, and when i crank up the heater all the way it drops even lower. ANY IDEAS? Thinking of going to junkyard and getting a new IAC (Plunger part). But i'm getting OK resistance though. I'm getting 9.0, it is supposed to be 7-9.3. This is all done on a 1998 Mazda 626 2.0L with Automatic transmission with around 160k miles on it.
2001 Mazda 626 4cyl I recently replaced my valve cover gasket (it was a little leaky.) The car ran seemingly fine before this. While changing the gasket I noticed one of the spark plug holes had oil in it (Not sure if this is relevant.) After I changed the gasket, the car seemed to run fine then i noticed that in neutral and in park the idle would dip super low. It kind of feels like it's fighting off stalling almost. The next day, I bought new spark plugs and replaced them. I drove the car to normal operating temp and tested it in neutral and park and even stopped but with the A/C on and it didn't idle low anymore, so I thought it was fixed. Well, the next time I drove it, it started doing the same thing again. So now every time I am in park, neutral, or even drive if I'm stopped and have the A/C or fan on it idles really low. I have a squeaky belt I'm getting replaced this weekend but it was squeaking before I even changed the gasket and I didn't have this problem. Any idea what the problem is? I am not a car person and can only do very basic things. Thanks in advance
I have a 98 626 with an ongoing problem that is driving me (no pun intended) nuts. It a 2 liter, 5 speed that has 200,000 miles (not 'k') on it that has been the best car ever that I've had. The only thing that I've ever had to replace is a 1/2 shaft due to a torn boot. I can't get rid of a misfire that I've had for a couple of years. I've replaced the plugs, the plug wires, the fuel filter, the coil pack. I've tried various fuel conditioners and higher octane gas all of which has very short term improvement. I 've he engine sputters at low rpm's when I step on the gas. If I let off the gas and then rev it again it is usually fine. It runs fine at higher rpm's unless I push on the gas too hard. I've read a lot lately that it may be the mass air flow sensor that needs to be cleaned but I'm not sure. Does anyone have ideas? Thanks in advance, Adrian