car's running rough.
car's running rough. in the past few weeks, my car's been running like crap. it sputters at WOT at around 4500 rpms and past, sounds like someone's shooting an ak47 under my car/out the exhaust. it would also do it in the city. it wouldn't replicate it in neutral free revving, only under load.
well, to start things off, my fuel pump had been going out, so I replaced it with a 255lph pump and a new filter. i also put on a new coil wire. soon thereafter, my car shot a code 13 and 34. i checked the MAP sensor seal, it was good, wiring was good, voltage good, so I swapped in a new MAP sensor. after this, it drove fine in the city but still made the gunshot noises at WOT. I took it to get the codes cleared so the parameters set by the computer would be like that of stock parameters. after i did this, car ran like **** all together again sputtering in city and WOT driving (leave from stop light, feel car choke, rpms drop and go back up). i drove it another 10 miles or so, and the car never shot another code.
what am i looking at here? after all the things i've done it seems like it's about time the opti would go out... none of my wires are arcing, it's not like it's a misfire, it's like the car's choking. is there any way to test the opti?
thanks.
well, to start things off, my fuel pump had been going out, so I replaced it with a 255lph pump and a new filter. i also put on a new coil wire. soon thereafter, my car shot a code 13 and 34. i checked the MAP sensor seal, it was good, wiring was good, voltage good, so I swapped in a new MAP sensor. after this, it drove fine in the city but still made the gunshot noises at WOT. I took it to get the codes cleared so the parameters set by the computer would be like that of stock parameters. after i did this, car ran like **** all together again sputtering in city and WOT driving (leave from stop light, feel car choke, rpms drop and go back up). i drove it another 10 miles or so, and the car never shot another code.
what am i looking at here? after all the things i've done it seems like it's about time the opti would go out... none of my wires are arcing, it's not like it's a misfire, it's like the car's choking. is there any way to test the opti?
thanks.
could i take the coil to someplace like autozone and get it tested? does the coil interface with sensors like the MAP? if not, I don't see why it would be the coil. All the symptoms seemed to point to the MAP sensor I was getting a code for.. would a bad O2 sensor cause symptoms like this? i can try to take a video if anyone cares..
Last edited by Crows93Z; Mar 20, 2009 at 07:20 PM.
Test the coil:
http://shbox.com/1/coil_testing.jpg
Get a scanner that can read real time data and see if the o2's are oscillating within the full required range.
The opti can cause hesitation and backfiring that you are mentioning. No real way to test it though.
http://shbox.com/1/coil_testing.jpg
Get a scanner that can read real time data and see if the o2's are oscillating within the full required range.
The opti can cause hesitation and backfiring that you are mentioning. No real way to test it though.
Yes, autozone has a coil tester that plugs in and does the test.
It could be IMC too, but what your discribing reminds me when my opti went out. I had the same symptoms, when it acted up it would fall on its face like it was bogging out.
It could be IMC too, but what your discribing reminds me when my opti went out. I had the same symptoms, when it acted up it would fall on its face like it was bogging out.
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That's weird, cause that's what they have to test the ICM, but not for the coil at any of the stores I've been to. It's like 5 pairs of LEDs, red and green. They all have to go green to pass the ICM.
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Verdad Gallardo Then I would say Crows93Z to use that link you posted up ss.slp.ls1
Id like to add, when my opti was going out I heard some strange noice come from the front of the engine like what your discribing.
Test the coil:
http://shbox.com/1/coil_testing.jpg
Get a scanner that can read real time data and see if the o2's are oscillating within the full required range.
The opti can cause hesitation and backfiring that you are mentioning. No real way to test it though.
http://shbox.com/1/coil_testing.jpg
Get a scanner that can read real time data and see if the o2's are oscillating within the full required range.
The opti can cause hesitation and backfiring that you are mentioning. No real way to test it though.
Yea, I was curious as well. On a '93, which is speed density, at temp. the O2 reading are pretty important and could cause the poor driveability being described. It also sounds like yet another opti...I just hate jumping on that opti condemning bandwagon but it always seems to be the case. I think they get wet by previous owners who don't know what they are doing in regards to an opti and that care should be taken when draining coolant or driving in rain as they charge 12" deep puddles at 45 mph...
