MAF sensor code P1174
#11
Sorry to thread jack, but what are your fuel trims. They will give you an indication of where to look next. I also had these codes a couple months back.
How's your purge valve? Gas Cap?
My trims indicated the ecu was adding fuel to compensate for unmetered air. After ruling out vacuum leaks I decided to replace the purge valve with the Hyundai unit and an stant gas cap off Amazon. No more codes and fuel trims stabilized to a healthy steady +/- 3%.
With your intent to replace fuel injectors sounds like your ecu is pulling fuel. Do you believe they are leaking?
How's your purge valve? Gas Cap?
My trims indicated the ecu was adding fuel to compensate for unmetered air. After ruling out vacuum leaks I decided to replace the purge valve with the Hyundai unit and an stant gas cap off Amazon. No more codes and fuel trims stabilized to a healthy steady +/- 3%.
With your intent to replace fuel injectors sounds like your ecu is pulling fuel. Do you believe they are leaking?
#13
#15
I've had P1174 for a few weeks now but no CEL (pending code).
Truck runs OK, maybe a little on the rough side, but fuel consumption could be better (I get ~400km to a tank).
The research I've done points towards vacuum leaks being the cause, not MAF. I have upper intake manifold gasket, valve covers, throttle body gasket all ready to go and will let you know if it fixes the issue. Next on my check list would be injector o rings and exhaust manifold to y pipe gaskets...
Truck runs OK, maybe a little on the rough side, but fuel consumption could be better (I get ~400km to a tank).
The research I've done points towards vacuum leaks being the cause, not MAF. I have upper intake manifold gasket, valve covers, throttle body gasket all ready to go and will let you know if it fixes the issue. Next on my check list would be injector o rings and exhaust manifold to y pipe gaskets...
#16
I had the p1171 and p1174 on my '01 that I had traced down to be dirty/sticking fuel injectors. This was on a vehicle that I bought with a blown headgasket and had sat for 5 years. I ended up doing the headgaskets etc so I had already replaced the injector o-rings. About 800 miles in, it started to idle ruff and had the two codes. According to my scan tool, all the O2 voltages looked good as did the MAF. It also draws about 18lbs of vacuum at idle. so I pulled the plugs, three of which had white ground electrodes. I pulled all the injectors and bench cleaned them with the jig I made using PB blaster followed by Techron fed through them via compressed air and a 12v trigger. All the patterns were ruff to begin with and two were sticking but after cleaning they all had a nice clean spray. It runs better than ever now and the codes cleared themselves. Truck has 122K on it.
#18
#19
yeah I know that was a dick comment, but why ask for advice and the do the opposite of what ppl are recommending?
#20