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get urself a can of carb cleaner...brake cleaner...whatevers clever with the car running spray it over vac maf sensor...until you hear the engine bog down. now you found ur vac leak or anything else and leaking.
check that the egr valve is not stuck open remove it and cover the hole on the intake side and see if it goes away or with engine running remove the vac line from the valve and install a short length of hose and suck on the hose to draw a vac on the valve it only takes 3-5 inches of vac to open it the engine should stall or run even worse if it is not stuck and if it was stuck open you didnt change anything
The codes for the O2 sensors mean they are not providing the data expected by the computer. Sometimes this means there is a problem upstream in the engine. If the engine is missfiring on one or more cylinders, it should set a code for those cylinders. Same thing with a vac leak. But low fuel pressure would not normally set a code. Depending on which sensors are setting codes, the catalytic converter could be faulty. Even a dirty air filter can cause problems with the O2 sensors.
what size engine do you have in the g-30 van. is it the plastic plenum. if it is there are rubber o-ring seals that go bad all the time and will cause the p0171,p0174,p0172,p0175 these are all lean codes also check for fuel pressure to make sure it is up to specs. have you changed your fuel filter lately this can effect fuel trims.
DTC P1506 is set when the PCM detects the
engine idle speed is greater than the desired rpm. This is most commonly
caused by a dirty or bad IAC valve. Cleaning the throttle body will,
most likely, cure this problem.
p1131 means that the bank #1 O2 sensor, the bank closest to the firewall,
cylinders 1-3 is showing a lean mixture. Could be a vacuum leak, a
misfire on that bank, an exaust leak upstream of the O2 sensor, fuel
control or injector problem on that bank, a faulty O2 sensor, faulty
PCM, faulty wiring in the engine control wiring harness. P0171In the vast majority of cases, simply cleaning the MAF sensor does
the trick. I
best to take it off and spray it with electronics cleaner or brake
Make sure you are careful not to damage the MAF sensor, and make
dry before reinstalling also Inspect all vacuum and PCV hoses, replace if necessaryCheck for a dirty fuel filter and proper fuel pressure
P0174 indicates a lean condition that the computer is trying to compensate for.. I would look for vacuum leaks. The vacuum hoses near the throttle body will dry out and split causing a leak. I would spray a little bit of carbeurator cleaner around the base of the throttle body and listen for an increase or change in the engine idle speed. If the idle changes the try to trace it down to one point where there is a leak. I would bet that you have a split or broken vacuum line in that area. Not an uncommon problem. If no vacuum leaks are found then I would start to suspect the MAF sensor.
Those are lean codes and a MAF (P0101) code. Make sure the MAF sensor is plugged in, and there are no leaks/ loose hoses between the air filter and the engine. You may have a vac leak at the intake also, but check these first, If all appears OK a repair shop will need to check it out for you.
Hi , i have a 1995 Escort with 1.9 4 cyl engine , at cold start the engine revs ok but as it get warmer it start to idle rought and die , with a scantool the o2 sensor always reed lean at idle , after checking fuel pressure , air mass meter , EGR valve , and potential vacuum leak at intake and hoses , its the PCV valve that give me that problem , as i remove the pipe with the valve there was a whissle noise comming from it , when i block the valve at its tip the whissle noise stop the engine revs smooter and the o2 reads normal , i replace the PCV and its idling good .