2naboy Posted December 13, 2004 Share Posted December 13, 2004 I'm new here so if any of this sound redundant I apologise. I am getting the following codes from the ecu my car is a 95: P0170 - fuel trim malfunction P0330 - knock sensor 2 circuit malfunction P0401 - egr flow insufficient I just bought the car and I have to go through emissions so I have to clear those codes. I think that maybe the first code maybe that I need to change the fuel filter or clean the fuel system because there is no engine misfire which leads me to believe that the injector may still be good just dirty but if I'm wrong, please correct me. For the second code I need some help locating the particular knock sensor and to find a place that sells it the cheapest I got $200 from autozone. I used to own a nissan maxima which had a very similar engine as this one and it only had one knock sensor and it was in the oddest position. I also know that when it went bad, the engine lost a lot of power which partially explains some of my powerloss. For the last code, I think I will clean out the egr valve and see if it will help. If anyone has had any experience with any of these codes please help any input is appreciated and again I apologise if this is a repost thank you. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted December 13, 2004 Share Posted December 13, 2004 sounds like you have a leaking injector causing all your problems hurry up and fix it before it burns out your cat as well if an injector leaks then the ecu can;t control it so it causes it to tel you it can't make it stop you will get a knock as it is spraying gas all the time the egr can;t control the burning of excess unburnt gas so it also throws a code get a technition to look at your car as #2 will lead you where to look Quote Link to comment Share on other sites More sharing options...
2naboy Posted December 13, 2004 Author Share Posted December 13, 2004 sounds like you have a leaking injector causing all your problemshurry up and fix it before it burns out your cat as well if an injector leaks then the ecu can;t control it so it causes it to tel you it can't make it stop you will get a knock as it is spraying gas all the time the egr can;t control the burning of excess unburnt gas so it also throws a code get a technition to look at your car as #2 will lead you where to look ← OK now that explains something. Lately I'm starting to get white somke at startup in the morning after sitting for about 6 - 8 hours. Do you think that this may be solved by just changing the faulty injector. I'm pretty well inclined in automotive work so I'm able to do that much or even try to diagnose it further but of course this is an engine i've never worked on. Quote Link to comment Share on other sites More sharing options...
mxl4729 Posted December 13, 2004 Share Posted December 13, 2004 sounds like you have a leaking injector causing all your problemshurry up and fix it before it burns out your cat as well if an injector leaks then the ecu can;t control it so it causes it to tel you it can't make it stop you will get a knock as it is spraying gas all the time the egr can;t control the burning of excess unburnt gas so it also throws a code get a technition to look at your car as #2 will lead you where to look ← OK now that explains something. Lately I'm starting to get white somke at startup in the morning after sitting for about 6 - 8 hours. Do you think that this may be solved by just changing the faulty injector. I'm pretty well inclined in automotive work so I'm able to do that much or even try to diagnose it further but of course this is an engine i've never worked on. ← you could start by pulling your plugs and see if any of those plugs are discolored or fouled and see what cylinder is causing the problem. I agree with sk I think all you codes lead back to one problem that is in turn giving you codes. do not start replacing parts because u get a code and that is part of the circuit (like the nock sensor). Quote Link to comment Share on other sites More sharing options...
SKperformance Posted December 13, 2004 Share Posted December 13, 2004 let a tech look at it Quote Link to comment Share on other sites More sharing options...
Macgyvr Posted December 27, 2004 Share Posted December 27, 2004 P0401 "egr insufficient flow" can indicate many things, including: 1-vacuum line plugged or leaking 2-pipe from exhaust to egr valve plugged 3-pipe to vacuum modulator valve from egr valve plugged 4-passages at egr are plugged 5-bad egr valve 6-bad EGR VACUUM MODULATOR VALVE I tried cleaning egr modulator valve, (beside/above egr)removed and tested egr vacuum & movement, inspected and cleaned all vacuum lines openings and pipes. All above did not work. I replaced the egr vacuum modulator valve. (25870-62020) Light went out without a reset in about 30 miles of driving. Not sure if this valve can be cleaned! Retails for $69.US I'm new here so if any of this sound redundant I apologise.I am getting the following codes from the ecu my car is a 95: P0170 - fuel trim malfunction P0330 - knock sensor 2 circuit malfunction P0401 - egr flow insufficient I just bought the car and I have to go through emissions so I have to clear those codes. I think that maybe the first code maybe that I need to change the fuel filter or clean the fuel system because there is no engine misfire which leads me to believe that the injector may still be good just dirty but if I'm wrong, please correct me. For the second code I need some help locating the particular knock sensor and to find a place that sells it the cheapest I got $200 from autozone. I used to own a nissan maxima which had a very similar engine as this one and it only had one knock sensor and it was in the oddest position. I also know that when it went bad, the engine lost a lot of power which partially explains some of my powerloss. For the last code, I think I will clean out the egr valve and see if it will help. If anyone has had any experience with any of these codes please help any input is appreciated and again I apologise if this is a repost thank you. ← Quote Link to comment Share on other sites More sharing options...
2naboy Posted December 28, 2004 Author Share Posted December 28, 2004 Ok so I finally get to looking at the engine and I discovered something and I dont know why I didn't notice this earlier but it turns out that my intake tube was cracked almost all the way round. So I replaced it and did a tuneup minus the spark plugs including the fuel filter. When I checked the filter it was so dirty that the fuel that came out the other side was dark brown I dont think the previous owners changed it for a long time. I went and reset the computer and after driving a couple of yards, the light came on again but this time it was only one and thats the p0330 knock sensor 2 circiut malfunction and this leads me to belive that the knock sensor is dead. Now I need to know which knock sensor it is, the right or left one and also where to get one at a good price the cheapest I found is at autozone for $199.99. Since I'am about to change the plugs I'll go ahead and do the sensor too. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted December 28, 2004 Share Posted December 28, 2004 it may be because of a dirty injector (unlikely) change the plugs first and clean the fuel system first motorvac Quote Link to comment Share on other sites More sharing options...
steviej Posted December 29, 2004 Share Posted December 29, 2004 it may be because of a dirty injector (unlikely)change the plugs first and clean the fuel system first motorvac ← agreed, that's what I would do too. Quote Link to comment Share on other sites More sharing options...
2naboy Posted December 29, 2004 Author Share Posted December 29, 2004 First of all, the codes for the fuel system malfunction, and the egr are gone its just the knock sensor left. I did run a fuel system cleaner and change my filter. The engine has over 151K miles on it so its not unreasonable to think that the knock sensor is dead. So does anyone know what particular sensor it is. Quote Link to comment Share on other sites More sharing options...
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