Mattsv8 Posted May 4, 2012 Report Share Posted May 4, 2012 Hey guys I've drove my car daily for the last mth or so and all was fine. Started to leve work and it had a miss at idle and when at rpm below 1500 it would cut in and out. I let steve see the codes and it shows rear o2s wich I knew cause there unpluged also showed right front 02. I replaced both front o2 sensors but the car is the same. I think I hear a rocker - lifter tick bent pushrod? I tried to floor it and it cuts in and out prety hard. O2 looked rich but they didn't fix it. Any ls1 guys have a idea I can check. Quote Link to comment Share on other sites More sharing options...
STEVE-O Posted May 4, 2012 Report Share Posted May 4, 2012 No misfire codes? Quote Link to comment Share on other sites More sharing options...
Green Bastard Posted May 4, 2012 Report Share Posted May 4, 2012 pull the plugs and take a look at them? im sure that would be a good start to replace the plugs, even if its not the problem, it couldnt hurt. Quote Link to comment Share on other sites More sharing options...
GTPSS Posted May 4, 2012 Report Share Posted May 4, 2012 Pull the valve covers and feel for any slop in the valvetrain? But the codes may actually tell you everything you need to know. Quote Link to comment Share on other sites More sharing options...
gillbot Posted May 4, 2012 Report Share Posted May 4, 2012 Pull the valve covers and feel for any slop in the valvetrain? But the codes may actually tell you everything you need to know. Is it stock? I'd check for broken valve springs too. Quote Link to comment Share on other sites More sharing options...
Cordell Posted May 4, 2012 Report Share Posted May 4, 2012 Stock pushrods bend easy, was it a rich or a lean code? Quote Link to comment Share on other sites More sharing options...
Not Brian Posted May 4, 2012 Report Share Posted May 4, 2012 Is the MAP sensor in there tight? Quote Link to comment Share on other sites More sharing options...
AJ Posted May 4, 2012 Report Share Posted May 4, 2012 Is the MAF dirty? Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 4, 2012 Author Report Share Posted May 4, 2012 No misfire codes? none and steve said the misfire usually flashes the check engine Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 4, 2012 Author Report Share Posted May 4, 2012 i wouldent think maf but ill clean it. drove perfectly to work and for the last few mths, car never really sees rpm over 2000. its all stock just lt headder and ory stock cat back for now. Quote Link to comment Share on other sites More sharing options...
SinisterSS Posted May 4, 2012 Report Share Posted May 4, 2012 Is the MAF dirty? +1 my camaro had a similar situation when I cleaned the K&Nair filter, oil got on the sensors in the MAF, it ran like shit, plus when I 1st got my car it ran like shit the check engine light was on with o2 codes, I checked the MAF it was dirty so I cleaned it, cleared the codes and it ran like a champ Quote Link to comment Share on other sites More sharing options...
gillbot Posted May 4, 2012 Report Share Posted May 4, 2012 none and steve said the misfire usually flashes the check engine random misfire flashes the MIL, I think a consistent misfire lights the MIL and throws a code. Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 4, 2012 Author Report Share Posted May 4, 2012 Brian is gona scan it today sometime hopefully it shows up. My car don't have a k&n just a fram filter. No oil Quote Link to comment Share on other sites More sharing options...
99ta Posted May 4, 2012 Report Share Posted May 4, 2012 Is the MAF dirty? or it went bad. i went through 3 before going SD. Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted May 4, 2012 Report Share Posted May 4, 2012 Could you have a small exhaust leak on one bank of cylinders? That could cause the O2 code, create problems like misfires if left in disrepair long enough... Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 4, 2012 Author Report Share Posted May 4, 2012 ok went to autozone got crc mass air cleaner. And a new filter I'm wondering if it maybe got wet from all these nights of rain Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 4, 2012 Author Report Share Posted May 4, 2012 Don't know about leaks there isint any from the head to the catback there is a leak at the catback where it connects behind the y pipe but that would be to far to creat a false lean. Quote Link to comment Share on other sites More sharing options...
Chadz89GTA Posted May 4, 2012 Report Share Posted May 4, 2012 My car threw lean codes til I got a new maf Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 4, 2012 Author Report Share Posted May 4, 2012 Tried to clean the maf and got a new fram air filter nope didn't fix it. When ur car has a code o2 rich and you replace them is it immediate better or do u drive it a while. This miss isint just 1 hole at 2000 rpm its smooth. I've had broken valvesprings and that is a dead miss at higher rpms cause the valve will bounce. Its smoth part throttle beyond 2000 rough below and u can't it. Ill post results after brian scans it. Quote Link to comment Share on other sites More sharing options...
99ta Posted May 4, 2012 Report Share Posted May 4, 2012 fouled plug? Quote Link to comment Share on other sites More sharing options...
AJ Posted May 4, 2012 Report Share Posted May 4, 2012 unplug the MAF and drive it again. Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 5, 2012 Author Report Share Posted May 5, 2012 I unpluged the maf when it was running and the car changed rpm. I'm gona change the plugs tomorrow Quote Link to comment Share on other sites More sharing options...
ODoyle Posted May 5, 2012 Report Share Posted May 5, 2012 U MAKE 8 SECOND S10! WHY U NO FIGURE OUT MISFIRE? On a serious note,changing the plugs probably isn't a horrible idea. One may have cracked or something. Quote Link to comment Share on other sites More sharing options...
LS_Sonoma Posted May 5, 2012 Report Share Posted May 5, 2012 One of the plug wires could be arcing on a header tube also. Make sure none are burnt. Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted May 5, 2012 Author Report Share Posted May 5, 2012 If it had a car it wwould be fixed already.I'm. Putting tr7s in it today there stock wires with the metal shield and none are close to headder. it don't seem like any single cyl sometimes its one then 5 in a row. Its symptoms aren't like any 1 thing in particular. Carb is way more simple. No sensors to fail no 8 inj to misfire or 8 coilpacks to test! I love me come carbs! Quote Link to comment Share on other sites More sharing options...
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