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drakesrevenge
01-18-2011, 10:54 AM
my 2001 has 312,XXX on it, have had some work done on it to keep it kickin' but now i've come across a problem i've never had before.

randomly, maybe once or twice a month, i'll be cruising along around 65 mph and the car feels like it is dying, only for like a second. initially i thought it was slipping from 4th to 3rd, because that's what it feels like. took it to the tranny shop. fluids okay and the guy tells me that something is wrong with the engine.....................however, there's no codes being activated.

could it be a fuel pump problem? --just had one put in last feb, and it only has about 25K on it.

plus my mpg has gone from about 26 to 21 in the last month. i'm putting in a new fuel filter tomorrow, even though it only has about 20K on it.

any suggestions on what it could be?

SC/T02
01-18-2011, 10:58 AM
Sounds like it could be a clogged cat. The problem is you should have those symptoms more frequnetly. When was the last tune up? Plugs, wires... ? You may have a fuel injector going bad and dumping gas into the engine causing it to flood teh engine and go through more gas then it use to. Just some shots in the dark here. Does it surge or have a rough idle at all? Can you smell any unburnt fumes?

drakesrevenge
01-18-2011, 11:18 AM
Just had plugs and wires replace last month, i don't smell any fumes. The last time i had a new cat was in 2005, which was about 185000 miles ago!

Injectors could be a problem, but, if an injector was bad wouldn't it throw off a code? Or would it only code if it was causing a misfire?

It does surge occasionally, but the idle seems okay usually.

[ChaosweaveR]
01-18-2011, 12:45 PM
I say either the cat, or a fuel pressure issue.

A dying injector is possible.

01GPGT
01-18-2011, 07:36 PM
it will not throw a code unless is misfires for at least 45 seconds. any less and it will not put up a code. also the missfire count has to be a certain number as well

drakesrevenge
01-20-2011, 09:46 AM
this morning on the way to work, it acted up about 5 times in the 17 miles i drove to work. car is "bucking" and and tach was jumping all over the place. in each instance, it only lasted probably a second to a second and a half. could it be an electrical problem? i'm really freaking out!

grandam3400
01-20-2011, 02:07 PM
my 2001 has 312,XXX on it,

I think that's your problem. Time for a new car!

Armydoc87
01-20-2011, 10:20 PM
My car seems to do the same thing. Is it causing a SVS light, b/c mine does? And the weird thing is that my SVS light doesn't come on all the time, just seems to be during the day. Mine straightened out a little after a tune up, I just have to still change the fuel filter. I have seafoamed the hell out of my car and every oil change I run a bottle of Lucas fuel treatment through it and it seems to help, but still cant figure out the rough idle when the car is first started. It may have something to do with my remote start though, that's the only time I notice it. But it seems to clear out when I idle it up some, so who knows. I hope changing the filter solves some of the problems. My car is a 00 with about 127,000 kilometers(so roughly about 76k miles.) It was lugging real hard when going up hills and stuff at around 2k rpm's but the tune up seemed to fix that problem. Now if I can figure out the rest and get my gas mileage back, I might keep the car...

Don't mean to jack your thread but I figured instead of starting a new one, I would post it in here since you have similar issues and maybe I can get some good answers from some of these guys in here.

drakesrevenge
01-21-2011, 12:42 PM
yeah, my SVS light has been on, BUT it was on before because i have a short in the connecter on one of my wheel bearings.

i'm gotta order some new parts--
iginition coil packs for 4 of the cylinders, i just replaced one of the other coil packs a month ago.

see what happens from there. it almost seems like an eletrical problem to me, but who know. i'll put a new cat in when i get my tax return back.

good luck with your car too!

Ceej
01-21-2011, 10:40 PM
Oh hey mine bucks too! It's so annoying

stillriza
01-22-2011, 05:24 AM
Your car runs on a low mileage & consumes too much fuel..when was the last time you replaced the o2 sensor?

The missfire would usually be caused when a bad o2 sensor affects the air/fuel mixture and engine combustion. It's more evident @ idle or running at a very low speed.

Same with the rough idle..O2 sensor plays a significant role in regulating the air/fuel mixture, engine timing and intervals between engine combustion, ther's no doubt a bad oxygen sensor will cause the engine to run rough or irregularly.

Any engine pinging? A bad O2 sensor either retards or advances the engine ignition timing, which will cause engine pinging.

AaronGTR
01-22-2011, 08:13 AM
Your car runs on a low mileage & consumes too much fuel..when was the last time you replaced the o2 sensor?

The missfire would usually be caused when a bad o2 sensor affects the air/fuel mixture and engine combustion. It's more evident @ idle or running at a very low speed.

Same with the rough idle..O2 sensor plays a significant role in regulating the air/fuel mixture, engine timing and intervals between engine combustion, ther's no doubt a bad oxygen sensor will cause the engine to run rough or irregularly.

Any engine pinging? A bad O2 sensor either retards or advances the engine ignition timing, which will cause engine pinging.


Nope. Actually the O2 sensor has absolutely NOTHING to do with ignition timing. It makes adjustments to air/fuel ratios and that's all. It can cause bad mileage for sure if it's not working properly, and can cause detonation in certain circumstances, but it usually is not the culprit for misfires.

drakesrevenge
01-23-2011, 10:58 AM
O2 sensors were replace a month ago.
i got up this morning and changed out the ignition coils, drove it about 40 miles and had NO problems whatsoever.
will see if fuel consumption gets better, if not will go on from there!

thanks guys for all your input!

drakesrevenge
01-26-2011, 03:11 PM
i spoke too soon! she's back to her old antics again! dammit all!

cutlsp
01-26-2011, 03:31 PM
how old is the ignition control module?

drakesrevenge
01-27-2011, 01:47 PM
iginition control module has never been replaced, i need to look into that next.

drakesrevenge
02-08-2011, 09:26 AM
FYI, in case anyone else ever runs into this problem.

car never threw codes when scanned. however, while driving it randomly misfired on all cylinders at different intervals, as my mechanic and i drove and scanned at the same time.

i cleaned all connecters on ignition control module and cleaned mass airflow sensor.

also put on more electric grease where ignition coils plug into the ICM. has not misfired in 3 days now.

cutlsp
02-08-2011, 09:40 AM
hopefully it stays fixed this time. How bad were the ICM connectors?

drakesrevenge
02-08-2011, 10:46 AM
hopefully it stays fixed this time. How bad were the ICM connectors?

they didn't look bad at all, but i went ahead and cleaned them anyway, i used mass airflow sensor cleaner (in a spray can) on them.