Last post on Jul 10, 2013 at 12:45 PM
You are in the Maintenance & Repair
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Engine, Fuel System
#451 of 465 Re: stumped [mybonnie]
Oct 05, 2010 (12:58 pm)
I have a sensor an obo 2 diagnostic unit, My 99 bonny se said it was the mass air flow , and they have a cleaner that you can use to help if it is just dirty, and you won't maybe be able to see any dirt it's micro, it helped me some but now I am moving on to the EGR sensor and if it's not that I mwas told it might be the air vacume canister , I don't know where it is but if u you look up bonny scymantics you should locate it I hope it works for me. By the way to find your mass air flow unit just folow from your air filter to where there is no more rubber , take it off and spray it will be about 4 to 5 inches around , where you take it off it should be easy and the car should be cool when you do it or you will burn...auto101
#452 of 465 Stalling while driving 94 Buick Lesbra
Oct 10, 2010 (4:44 am)
Have 94 Buick Lesbra Limited 3.8 engine 149,053 miles car runs great but stalls while driving, always start right up again. Change PVC valve, oxygen sensor, throttle position sensor, spark plugs and wires, air filter, cleaned throttle body put under diagnostic could not find bad code. Believed to be electrical but don't know what.
#453 of 465 Re: Stalling while driving 94 Buick Lesbra [1xonly]
Oct 10, 2010 (5:01 am)
It sounds like a possible combustion problem, but I would start looking into the fuel pump , or system in general , does your car have a fuel regulator for pressure? If it does your normal box parts store might be able to help locate it and check it, I have had to by a pressure check , it was 23 dollars, that if you can't find one...
#454 of 465 Re: Stalling 94 Olds Cutlass Ciera [ramman8]
Sep 30, 2011 (10:07 am)
Did you ever figure out what it was? I am having the same problem, same car.
#455 of 465 idle problems
May 26, 2012 (12:09 pm)
I have a 1994 probe when it is first driven when cold it runs fine. The longer i drive it the more it misses and cuts in and out. Did a tune-up on it 3 weeks ago and it ran great for about a week and now it is right back to the way it was running before the tune-up...Any suggestions on what this could be. Also the check engine light comes on and goes off at various times..HELP!!!!
#456 of 465 Re: idle problems [beckygr]
by MrShift@Edmunds HOST
May 26, 2012 (4:48 pm)
EGR problems? Has those kinds of symptoms.
#457 of 465 91 S10 Blazer running rich, stalling on deceleration
Sep 15, 2012 (10:45 am)
91 S10 Blazer Sport, auto, 4X4, 4.3L TBI. 189000 miles. No trouble codes. Code 12 only. Recent post #171 in Chev. Blazer forum. No response. Guess no one is interested in dinosaurs. Since that post have learned more how to use scanner. The O2 sensor generates abt. .550v max. at idle. and does not reach necessary .620 [for closed loop in this engine] until operating at 2000 or more RPM for close to one minute. In city driving it rarely meets this condition so remains in open loop most of the time. I think this explains excess fuel and stalling at sudden deceleration. Much to rich in open loop. Runs great on the interstate and gets 22mpg there. Could be the exhaust gas not hot enough at low speed, for the O2, but cannot find why. The O2 is new [ third one ] , MAP new and test normal. Coolant sensor new and changed twice. Thermostat as well [ 195F]. EGR is new. Vacuum abt. 16 at idle abt. 22 at 2000RPM. Does have a little jitter. Should not be necessary but I am tempted to change to a heated O2. Might solve the immediate problem but may be a crutch. Hope one of you Super techs can solve where four shops and I have failed. I love this old lady.
#458 of 465 Re: 91 S10 Blazer running rich, stalling on deceleration [rfletcher]
Sep 17, 2012 (6:32 am)
Is the O2 sensor a 3 wire unit, with the built-in heater? Maybe the heater circuit is open.
#459 of 465 Re: 91 S10 Blazer running rich, stalling on deceleration [srs_49]
Sep 17, 2012 (10:52 am)
Thanks, No, it's a new replacement O2 but the original one wire type. That's why I considered changing to the heated version. Real pain to do and a lot more expensive but would probably solve if not correct the problem. Seems a vicious circle. As I understand it, among other things, excess fuel will tend to cool the exhaust and non functioning / cooler than normal O2 will cause excess fuel. Maybe someone smarter than me can explain it.