2fast2six Posted April 16, 2013 Report Share Posted April 16, 2013 (edited) .VIEW LAST POSTS ON CURRENT ISSUE WITH CAR RUNNING RICH UNDER BOOST Edited June 15, 2013 by 2fast2six Link to comment Share on other sites More sharing options...
Shelby Posted April 16, 2013 Report Share Posted April 16, 2013 ok check to see if the ecu is in close'd loop if you have an after market air/fuel meter and the neddle is not jumping all over,,it's still in open loop Link to comment Share on other sites More sharing options...
2fast2six Posted April 16, 2013 Author Report Share Posted April 16, 2013 how can i check to see if its in open loop? i have an aem wideband.. ran good till yesterday. needle isent jumping all over the place. Link to comment Share on other sites More sharing options...
scott87star Posted April 16, 2013 Report Share Posted April 16, 2013 Closed loop is when the ECU is using the o2 sensor to control fuel. Since the old narrow band sensors are only accurate in one place, 14.7 AFR, the ECU actually richens and leans the mixture so its constantly crossing over the accurate spot and on your wideband it would appear to be oscillating from maybe 14.2 to 15.2 AFR at cruise, constantly. That's closed loop control. Do you still have the factory O2 sensor hooked up? Link to comment Share on other sites More sharing options...
wrngwae Posted April 16, 2013 Report Share Posted April 16, 2013 is it possible you have the clips switched. primary injector is smaller. is it an 87+ car? Link to comment Share on other sites More sharing options...
2fast2six Posted April 16, 2013 Author Report Share Posted April 16, 2013 its a 1987 .no im just running the wideband sensor in the spot where the oem o2 sensor was and it never seemed to be an issue before.. and i believe the injector clips are in the right spot. im at work right now but i believe the black injector is closest to drivers side fender... blue/greenish one is towards passenger side Link to comment Share on other sites More sharing options...
scott87star Posted April 16, 2013 Report Share Posted April 16, 2013 So you just didn't hook anything back up for the ecu? Use the narrow band emulation output and help the ecu go its job. Link to comment Share on other sites More sharing options...
Shelby Posted April 16, 2013 Report Share Posted April 16, 2013 so you do away with the factory 02 sensor and then wonder if the ecu is in open loop hum that wide band sensor ain't gona last long in the oem 02's position , too hot for ityou want it about 12-14" down the down pipe just above the turn Link to comment Share on other sites More sharing options...
2fast2six Posted April 16, 2013 Author Report Share Posted April 16, 2013 i bought the car hooked up like that i havent touched the 02 or wideband or ecu Link to comment Share on other sites More sharing options...
Shelby Posted April 16, 2013 Report Share Posted April 16, 2013 ok first get an oem 02 sensor or a 3 wire and install that,, remove the wide band sensor and save for a new location further down the exh down pipe behind the abs unit on the fire wall you should see a single wire grommet this is the ecu 02 sensor signal wire , connect the 02 signal wire to this wire , be careful the wire is shield'd so make sure you do not short out the signal Link to comment Share on other sites More sharing options...
mistapickles Posted April 16, 2013 Report Share Posted April 16, 2013 ok first get an oem 02 sensor or a 3 wire and install that,, remove the wide band sensor and save for a new location further down the exh down pipebehind the abs unit on the fire wall you should see a single wire grommet this is the ecu 02 sensor signal wire , connect the 02 signal wire to this wire , be careful the wire is shield'd so make sure you do not short out the signalwhat he said... also check your cts and isc, they'll make it run rich also Link to comment Share on other sites More sharing options...
2fast2six Posted April 17, 2013 Author Report Share Posted April 17, 2013 (edited) took out the wideband sensor and put in a stock o2 sensor. same problem. nothing changed... could a bov sticking or not working correctly cause this problem? how can i tell if injector clips are backwards? Edited April 17, 2013 by 2fast2six Link to comment Share on other sites More sharing options...
wrngwae Posted April 17, 2013 Report Share Posted April 17, 2013 how can i tell if injector clips are backwards? Swap them on the mixer. just unplug them and switch connections. Link to comment Share on other sites More sharing options...
Shelby Posted April 17, 2013 Report Share Posted April 17, 2013 unplug both injs clips,, plug one at a time onto the pri inj, when the engine starts you have the clips right , now once you know what clip is what,, mark them so you can id them at a later date pri inj is blk and towards the drivers fender Link to comment Share on other sites More sharing options...
2fast2six Posted April 18, 2013 Author Report Share Posted April 18, 2013 the enigne starts now.. and runs it just gets too much fuel under light driving throttle or not enough fuel under hard on the throttle.. maybe i should check on the cts. which one is it in the intake Link to comment Share on other sites More sharing options...
wrngwae Posted April 18, 2013 Report Share Posted April 18, 2013 Have you tryed the injector clips???? inplug the green one.... does it still run? Link to comment Share on other sites More sharing options...
mistapickles Posted April 18, 2013 Report Share Posted April 18, 2013 the enigne starts now.. and runs it just gets too much fuel under light driving throttle or not enough fuel under hard on the throttle.. maybe i should check on the cts. which one is it in the intakeit's the verticle two prong sensor. Disconnect your battery, unplug it, reconnect your battery then take it for a drive... It'd probably be good to disconnect your ISC at the same time, that nose switch goes bad and sends the computer all kinds of weird stuff. When they are disconnected the computer throws them in closed loop, so it will assume everything is perfect. If it's not that probably a leaky injector or something Link to comment Share on other sites More sharing options...
Shelby Posted April 18, 2013 Report Share Posted April 18, 2013 people one more time READ the How the System works in the beginning of the FUEL chapter in the FSMif you do not understand how the system works and what part does what ,, you will NEVER get it running properly it's only 20 minutes worth of read time but it will save you weeks worth of time Link to comment Share on other sites More sharing options...
2fast2six Posted April 20, 2013 Author Report Share Posted April 20, 2013 i tried swapping the injector clips.. seemed to not change anything. i unpluged the cts sensor and it seemed to run alot better. gunna try and swap out a differnt cts and see what happens Link to comment Share on other sites More sharing options...
Shelby Posted April 20, 2013 Report Share Posted April 20, 2013 i tried swapping the injector clips.. seemed to not change anything. i unpluged the cts sensor and it seemed to run alot better. gunna try and swap out a differnt cts and see what happens swaping both inj clips tells you NOTHING , the engine is running on ONE inj only,, which inj clip is it running on and is one or more inj stuck open,, your going to have to do some real work here and see whats going on , remove the inj top cap KEEP the injs in place , they will blow out of place from the pressure if you do not and spray gas every where , use some heavy string or wire to tie the injs in place , run the fuel pump by way of the fuel pump test connector and a jumper to the batt posi terminal,, check both injs for fuel leaking also check the pressure regulator hose for fuel leaking out of it ,, while at it check the letters on the injs to make sure the proper inj's are install'd you can find your problem with in 10 minutes if you realy want to Link to comment Share on other sites More sharing options...
2fast2six Posted May 13, 2013 Author Report Share Posted May 13, 2013 my problem was a clogged pre fuel pump filter. replaced it and car runs great. Link to comment Share on other sites More sharing options...
Shelby Posted May 14, 2013 Report Share Posted May 14, 2013 if you had enought trash to plug the one filter , best pull the intank pipe and check the intank filter Link to comment Share on other sites More sharing options...
2fast2six Posted June 3, 2013 Author Report Share Posted June 3, 2013 tank looked brand new inside, not a trace of any crap. intake filter looked like it had been replaced recently. replaced the fuel filter in the engine bay and everything seems to be good Link to comment Share on other sites More sharing options...
Caliber308 Posted June 3, 2013 Report Share Posted June 3, 2013 Running "pig" rich with a clogged Fuel filter??????? You would think it would be "pig" lean. Bill Link to comment Share on other sites More sharing options...
patra_is_here Posted June 3, 2013 Report Share Posted June 3, 2013 maybe low fuel pressure from the filter caused bad atomization and therefore lots of unburnt fuel? Link to comment Share on other sites More sharing options...
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