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Question Asked: Bleeding Front-Disc Brake using a one-man pump kit, but the vacuum level dropped after stop pumping, why?
April 25, 2016, 04:09 PM
I tested my newly purchased one-man disc brake bleeding kit with hand pump. I used a tight fit rubber adapter to the brake valve, after pumping to get a moderate vacuum level, the vacuum level dropped after stopped pumping. Is this okay to do brake fluid bleeding, keep pumping the vacuum? or there is a leak? thanks
May 11, 2015, 10:35 AM
My Chevy Lumina-sedan 95 3.1L V6's Driven-belt tensioner for Power-steering pump, water pump, alternator etc. has its bolt attached to the timing-chain cover, whose thread is wearing off. In order not to put too much stress on the thread, May I ask what the lowest torque strength needs to hold the bolt? thanks
April 01, 2015, 03:01 PM
After the gas analysis of the before cat. NOx and the after cat. NOx, the efficiency of a working cat. would be 70%-75% and above!
March 02, 2015, 11:16 AM
I like to check my 95 Chevy Lumina 3.1L V6's Catalytic converter's efficiency in reducing NOx. What is the exceptable (threshold) percentage? 50% for 1000ppm NOx before converter, and 500ppm after converter, ok? thanks!
February 09, 2015, 10:01 AM
My chevy lumina 95 3.1L V6 has a weak/small and intermitten leak at the flange gasket between the exhaust manifold and the exhaust pipe before the catalytic converter. Will this leak cause a problem with California smog test? NOx? Thanks in advance for your replies!
Question Asked: Higher smog test NOx at 1610rpm(25mph) than that at 1670rpm(15mph)?
February 05, 2015, 10:29 AM
Smog test result shows too high NOx at both 25mph and 15mph, but good higher NOx at 1610rpm(25mph) than that at 1670rpm(15mph), where the engine generate higher gases. what gone wrong? the engine ? the CAT. converter's leaking? or damaged? Thanks for reply.
Question Asked: NOx SMOG TEST FAIL?
February 02, 2015, 03:20 PM
Just had a CA smog test from a star center. The results are okay, except NOx as below: HC(ppm) 18/59(max.)@15mph(1663rpm), 13/34 @25mph(1616rpm)OK CO(%) 0.03/0.34@15mph, 0.02/0.32@25mph OK(PASSED) %CO2 14.6@15mph, 14.6@25mph %O2 0.2@15mph, 0.1@25mph NO(ppm) 710/484 @15mph, 797/498 @25mph NOT OK (FAILED) Note that the mechanics took quite a long time doing the test, and said that the engine was too hot, temp. gauge passed middle, was about a quarter to red zone. Few months ago, I also had a one-time error code 77, EGR value #3 error; it never showed again after reset though. The catalytic conveter/Oxy sensor are about 2 and a half year old. Please let me know what wrong and how to fix the NOx error. Thanks in Advance.
January 29, 2015, 10:18 AM
My Chevy Lumina-sedan 95 3.1V6 engine shows camshaft sensor error code 17, but the engine starts up fine and idles&runs smooth no backfires, in my opinion. If camshaft sensor not the problem, whatelses wrong can tickle this error code 17 on OBD1? thank you for your reply in advance!
Question Asked: A Chevy Lumina-sedan 3.1LV6's fuel pump issue?
January 26, 2015, 10:12 AM
When I first turn the ignition key to on position, not yet starting position, I will hear the fuel pump's motor running noise momentarily, indicating fuel pump running. My question is that will the fuel pump be running momentarily everytime the key turn to "ON" position? if so, can the fuel pump's motor running noise be quieter due to some reasons?
Question Asked: My 4-cylinder Benz engine stalling when rev it up in the Morning?
January 23, 2015, 03:04 PM
My 4-cylinder with non-electrical fuel injection, Benz engine starts to stall when rev it up after first start up in the morning; the engine starts up oaky, ideling may be a bit rough. But it works okay after warm up to normal operatinal temperature. what can be the causes? thanks
Question Answered: tempeture gauge is above half way point
April 01, 2015, 02:58 PM
I believe the ECM computer is programmed to turn on the first fan at about 223 degrees, and the second fan at about 240 degree or above. So, the engine temp. is maintained at about 223 degree at least by the first fan, and the temperature gauge is about a quarter passed the half way point, as you said. Since ECM is programmed by GM, there must be a tech. reason why engine temp. is kept this way! ( not at the half way point, like many newer cars)
Question Answered: wont start turns not get spark. what do i do
February 10, 2015, 04:12 PM
Since you just doing the ignition works, I will first make sure that the sparks are getting ignition voltages from the coils, using a spark plug's light tester available at most auto parts stores, who can tell you how to use it, not too difficult.
Question Answered: what is leaking?
January 20, 2015, 06:02 PM
check the pressure line,hose&fittings to see if they are wet, if so then you know what leaking. need two correct sizes wrenches to unconnect and reconnect the new hose.
Question Answered: What would cause my Low Coolant light to stay on if my coolant isn't low?
July 28, 2014, 02:00 PM
Happened to me, I replaced to a new sensor. The light still came on for awhile, but later disappear for good. May be the ECU needs some times to adjust!?
Question Answered: car idle drops and car dies out when at stop.
October 08, 2013, 05:24 PM
I think it is IAC (idle air control valve). It locates near the air throttle body. removing two bolts and the IAC can be taken out to check or replace. Also check if the air channel is clogged. good luck
Question Answered: Can you tell without a machine if coil module is bad?
August 01, 2013, 04:34 PM
Either ignition system or fuel system or both, is the problem. Check ignition system is easier, go buy a spark plug test, which can insert between the coil electrode and the spark plug wire. It will light up and blink if that spark plug, its wire and its coil work okay. Test all spark plugs and wires. If all okay, now need to check fuel system, go loan a fuel pump test gauge from an auto store, there is a port on the fuel rail that you can connect the test gauge to. Read instruction in details before you do it, since it involves fuel!! fire hazard!
Question Answered: When i idle my Benz runs hot..near 120. If I keep moving it's fine.
July 01, 2013, 05:53 PM
I guess the engine's temperature was okay, while traveling, since you only mentioned hot while idleing. Then, you may be right about the Fan or Fans, not working. If I remember correctly there are two fans or even three fans: one fan from engine's crankshaft behind the radiator, another fan in front of radiator for Air-conditoner's condensor. You can check them by idling the engine, open the hood and look at the behind fan, it should turn on before 100 mark on temperature gauge. Then, turn on your Air-conditioner and check if the front fan turn on. If either not working, you need to take to a good mechanics soon, this can damage your engine from overheat!!!
Question Answered: where is the evap vent solenoid located
June 19, 2013, 09:23 AM
For 95 Lumina-sedan, it locates below the ignition coil package near the firewall. You will have to rotate the engine to work on it!
Question Answered: How can I find the pcv hose on my 1995 chevy lumina?
April 08, 2013, 04:05 PM
I had same issue. it depends on where the crack is: if it is in the open easily accessible, you buy a low-cost rubber hose, slightly bigger than the pcv hose, make a short section and put it over the crack area. Or buy a whole new hose from a GM dealer cosing about $40
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