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4968 messages, Last post on Dec 06, 2009 at 4:49 PM

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What is this discussion about? Brakes, Electrical, Engine, Exhaust

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#1916 of 4968 Re: "Grinding" sound when accelerating [Mr_Shiftright] by lb388 Aug 22, 2005 (9:55 am)
Replying to: Mr_Shiftright (Aug 22, 2005 7:50 am) Thanks. What if the highest octane gas does not solve the problem? I've been using the mid range octane gas for months but never have such problem. Replies to this message: Mr_Shiftright (Aug 22, 2005 9:58 am) lb388 (Aug 22, 2005 10:19 am) Mr_Shiftright (Aug 22, 2005 12:34 pm)
#1917 of 4968 Re: "Grinding" sound when accelerating [lb388] by Mr_Shiftright HOST Aug 22, 2005 (9:58 am)
Replying to: lb388 (Aug 22, 2005 9:55 am) Well I can't hear what you're hearing. Real "pinging" sounds like a chain dragging under your car. It only happens on acceleration when the car is working or under load. You may need to have a friend or mechanic ride with you to determine if this is really pinging. If it is and it's heavy and continuous, it can damage your engine. Replies to this message: lb388 (Aug 22, 2005 10:19 am) Mr_Shiftright (Aug 22, 2005 12:34 pm)
#1918 of 4968 Re: "Grinding" sound when accelerating [Mr_Shiftright] by lb388 Aug 22, 2005 (10:19 am)
Replying to: Mr_Shiftright (Aug 22, 2005 9:58 am) Yup. That's what it sounds like. It needs to be looked into. Thanks for your patience and prompt response. I just want to gather more advice before I go to the mechanic. Majority of mechanics are happy to tell you that the pinging sound is serious. Hence, it helps to have some preparatory advice before I bring my car to the workshop. Could you offer some advice as to what parts I am looking to replace when I bring the car to the mechanic? Any idea on the range of cost this will incur? Replies to this message: Mr_Shiftright (Aug 22, 2005 12:34 pm)
#1919 of 4968 Re: "Grinding" sound when accelerating [lb388] by Mr_Shiftright HOST Aug 22, 2005 (12:34 pm)
Replying to: lb388 (Aug 22, 2005 10:19 am) Well pinging is usually a condition caused by either wrong engine timing or by heavy carbonization of the cylinders. Your car's computer is supposed to adjust your timing for you as it senses engine "knock"---so perhaps one of your engine's sensors is out of whack and the computer can't adjust your timing properly. Heavy pinging that doesn't go away will most certainly harm your engine, and can punch a hole clean through your pistons.
#1920 of 4968 2001 Nissan Sentra - replacing multiple oxygen 02 sensors by dlarruso Aug 22, 2005 (12:42 pm)
Hey kids- My 2001 nissan sentra GXE started having big time performance issues- like not being able accelerate very quickly and making funny popcorn popping like noises in the muffler region of my car. The check engine soon light was on as well so I brought it to my local mechanics who have done a great job for all of my cars. They inspected the engine light and multiple codes came on. They cleared the codes, took it on a road test and only the 02 sensor & engine lean codes came back. My car had a engine misfire from Cylinder #1 and they replaced the 02 sensor, 4 spark plugs, and cylinder #1 coil and they cleared the codes. They took it on a test drive and the codes did not return. When I went to pick up my car after work as soon as I turned the car on the check engine light came on. I left it for the mechanics to keep working on. They told me that the error was still indicating a bad 02 sensor even thought they had just replaced it. They put another one in- cleared it- drove it and the light came back on- they put in a 3rd new one- drove it for 5 miles and it did not come back on. So I pick it up again and drive home and 6 miles down the road the light comes back on. I brought it back to them this morning. Anyone else have or have heard of this problem where 02 sensors that are new keep causing the check engine light to come back on? All of the performance issues are gone since they worked on it the first time- its just that stupid check engine light that keeps coming on, and I need it to stay off because you can't pass emmisions inspection in AZ with it on. Thanks -Daniel Replies to this message: alcan (Aug 22, 2005 4:13 pm)
#1921 of 4968 Re: 2001 Nissan Sentra - replacing multiple oxygen 02 sensors [dlarruso] by alcan Aug 22, 2005 (4:13 pm)
Replying to: dlarruso (Aug 22, 2005 12:42 pm) The scan tool that says that an O2 sensor is defective hasn't been invented yet. First, diagnostic trouble codes refer to sensor circuits, not necessarily the sensors themselves. Second, if there's an engine driveability problem causing the engine to run lean, then the O2 sensors are going to keep reporting a lean mixture and your mechanic can keep replacing them until the threads in the manifolds are worn out without fixing the problem. Find out why it's running lean.
#1922 of 4968 Excessive exhaust by blahzey Aug 24, 2005 (4:38 am)
My 1998 Chrysler concorde (125k) spews out an excessive amount of exhaust upon acceleration and my gas mileage is low. I had the pcv valve replaced by the dealer who said this may fix it or else it may be a valve. I don't drive this car much anymore (approx 1k per month), do you think it might last for another 12-15k? If not is there something inexpensive I can do to get it to last that long? Thanks, Replies to this message: Mr_Shiftright (Aug 24, 2005 8:10 am) blahzey (Aug 27, 2005 11:26 am) Mr_Shiftright (Aug 27, 2005 1:23 pm)
#1923 of 4968 Re: Excessive exhaust [blahzey] by Mr_Shiftright HOST Aug 24, 2005 (8:10 am)
Replying to: blahzey (Aug 24, 2005 4:38 am) Time to stop guessing and throwing parts at the car and get some quantitative data. Not sure what you mean by "excessive exhaust" as this could be BLACK like unburned fuel or BLUE like burning oil----those two colors mean two very different problems. So you'll need to do a cylinder leakdown test to see if you have excessive engine wear and piston ring blow-by, and if not, then a fuel/air analysis/computer scan to see if you are misfiring on one or more cylinders. If you are spewing out unburned fuel, you are going to wreck your catalytic converter pretty darn quick. Replies to this message: blahzey (Aug 27, 2005 11:26 am) Mr_Shiftright (Aug 27, 2005 1:23 pm)
#1924 of 4968 hunter road force balancing machine numbers by edh Aug 24, 2005 (12:23 pm)
what are good and bad numbers? I had my two front 15,000 mileage Kumho tires done- both rims passed radial (up and down) runouts were .005 and .008. the road force with the tires was 17 pounds on one tire - rated as a pass and on the 2nd tire was 26 pounds, rated "marginal" for the tire but the tire/wheel assembly was a "pass" . 1. are these numbers good or bad? 2. what do you pay for a road force hunter 9700 machine balance? Nissan dealer in So Carolina want $40 per tire (!!) Infiniti dealer wants $35 per tire Replies to this message: imidazol97 (Aug 24, 2005 6:08 pm)
#1925 of 4968 Re: hunter road force balancing machine numbers by edh by capriracer Aug 24, 2005 (2:52 pm)
A couple of thoughts: The Hunter machine gave "good" and "bad" indications, which you explained in your post. I think you can trust the machine to be objective. If your rims were measured with the tires still on them, then you didn't get a complete picture of the state of the wheels - just an indication. The best way to measure wheels is with the tires off and then measure exactly where the beads seat. There is a "quirk" in the Hunter machine where it judges wheels to the same criteria as the tires and the assembly. This means that a horrible wheel will "pass". However, what's important is the assembly value. Just keep the wheel peculiarity in mind when trying to judge the wheels by themselves. Hope this helps.