schickdog Posted August 28, 2009 Share Posted August 28, 2009 Hey all. VG3.0 xev6. sudden onset of rough idle 1/2 way thru a tank of gas. Air filter is fine, fuel filter is new. cleaned the TBI, new cap, rotor, plugs, oil about 1K miles ago. black smoke. Runs fine but idles rough. ideas? Link to comment Share on other sites More sharing options...
headpeace Posted August 28, 2009 Share Posted August 28, 2009 Clean MAF? Link to comment Share on other sites More sharing options...
Precise1 Posted August 28, 2009 Share Posted August 28, 2009 First check the ECU for error codes (write up in the garage section/how to) and see what it says. If nothing, then clean the MAF and check the connection/wires. If that doesn't fix it, check the O2 sensor for resistance (1-1000 ohms) but I better look that up to confirm. Check all vacuum lines for leaks and let us know where you are with it... B Link to comment Share on other sites More sharing options...
schickdog Posted August 29, 2009 Author Share Posted August 29, 2009 will the ecu throw codes if no engine light comes on? yeah i cleaned the MAF and the connections are good. The o2 sensor is original so that's a suspect. all the vacuum lines are good too. it just happened all of a sudden. it was running like a top. weird. I am at work right now but i will double check everything tomorrow. I have a 5 hour drive planned tomorrow to head to South Padre island for a little wheeling. My question is, would you drive yours that far if its running a little rough and sputtering black smoke? it also misses in the 3000+ rpm area. no black smoke while revving tho. Maybe a stuck choke? it is the "electro ignition". Link to comment Share on other sites More sharing options...
schickdog Posted August 29, 2009 Author Share Posted August 29, 2009 and if it is a sticking choke, can i just spray carb cleaner ? Link to comment Share on other sites More sharing options...
mitsu Posted August 29, 2009 Share Posted August 29, 2009 black smoke is normally oil is being burned along wit the fuel so u shuld check ur head gaskets for any leaks there, caus if there is a leak it can cause a loss of power and poor performance, check it out and let me know Link to comment Share on other sites More sharing options...
adamzan Posted August 29, 2009 Share Posted August 29, 2009 Black smoke is too much fuel. Mine used to bog down in the 2800-3200 range when the o2 sensor was gone. I drove it 5 hours like that, it just got terrible mileage. Link to comment Share on other sites More sharing options...
Zibi Posted August 29, 2009 Share Posted August 29, 2009 (edited) vg33's and I believe vg30's are prone to cracked manifolds. If the crack gets big enough air will be sucked in, and since the ecu reads there as being too much air it will increase the fuel mixture causing your engine to run really rich. Cracked manifold should be fairly easy to notice, there will be an audible tick, but I figured it was worth mentioning. edit; burning oil generally causes blue smoke Edited August 29, 2009 by Zibi Link to comment Share on other sites More sharing options...
carwilef7 Posted August 29, 2009 Share Posted August 29, 2009 I had a bad MAF when I first got mine. It would idle okay for a while and sometimes drop to 400 and stall. Other times it would just fall flat on acceleration then stall. One night it blew gigantic clouds of black smoke and just kept refusing to idle at all. Replaced MAF and a split intake boot at the throttle body - fixed it. 95+ will set a code for MAF - dunno about earlier models. Link to comment Share on other sites More sharing options...
schickdog Posted August 29, 2009 Author Share Posted August 29, 2009 starting to idle real rough. it died when cold, almost dies at idle, misses bad, lots of smoke. I'm gonna bet it's the 02 sensor. $123 at autozone but it's my only option if i want to be on the beach in 6 hours. ugh. Link to comment Share on other sites More sharing options...
mitsu Posted August 30, 2009 Share Posted August 30, 2009 vg33's and I believe vg30's are prone to cracked manifolds. If the crack gets big enough air will be sucked in, and since the ecu reads there as being too much air it will increase the fuel mixture causing your engine to run really rich. Cracked manifold should be fairly easy to notice, there will be an audible tick, but I figured it was worth mentioning. edit; burning oil generally causes blue smoke oh ok thanks, for the edit Link to comment Share on other sites More sharing options...
schickdog Posted September 1, 2009 Author Share Posted September 1, 2009 02 sensor. fixed. Link to comment Share on other sites More sharing options...
Precise1 Posted September 1, 2009 Share Posted September 1, 2009 Glad it was easy and thanks for the update... B Link to comment Share on other sites More sharing options...
87pathy Posted September 1, 2009 Share Posted September 1, 2009 and if it is a sticking choke, can i just spray carb cleaner ? ya, make sure the carburator is clean. Link to comment Share on other sites More sharing options...
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