Maybe rounded off a cam, maybe a spring broke. Do a leakdown test and compression ratio. I hear you about the car quiting. I just got to putting the c-4 back in mine. Front seal went out. This is second time since had trans in car. Maurice
irregular idle and tapping noise. i'm sick of fixing this car.
1991 ranger motor
so a couple days ago while i was out the mustang just up and died while idleing, rpms dropped to 400 and it quit. he started right back up. after that, he got worse; wanted to idle really low at about 600, i had to do the two foot thing to keep the rpms up at 800 because i didnt want it to die again. as i'm going home it seemed like it was making less power than normal, not a huge difference but enough that i noticed. i started him up and he hasnt died at idle since, but the rpms will start out high going up to 1500 for about 20-30 sec, then dropping and staying in the 600-800 range. and then i hear a tapping comming from the engine. it seems like its in the head or throttlebody, but i cant pinpoint its exact location. it tapps more as the engine rpms go up, at least it does while parked with me pulling the throttle by hand, its too noisy while driving for me to tell if it taps or not. pulled the hose from the fuel pressure regulator, and it did smell mildly of fuel. it has plenty of clean oil in it, and the dummy gauge in the dash reads about 2/3rds.
i checked timing and the cam and crank marks line up 100% perfect. air filter is clean. i just regapped the plugs and they were only a little bit off and they looked completely perfect. the head is new with less than 2k on it. i sprayed the maf with maf cleaner and it didnt change anything. engine off and engine running gave the same two codes; 172 (o2 sensor says running lean) and 332 (insufficient egr flow), i also got a 116 for the ect, but i replaced it a couple weeks ago.
about a year and a half ago i took out the pcv and capped off the crankcase hose and the egr. it was supposed to be temporary, but i sorta forgot about it. i'm gonna try and clean the iac, but i'm having trouble getting the bolts to let go without stripping the heads. i'm gonna try changing the fuel filter too. the icm and coil packs are less than 2 months old, and the plug wires are only 2 years old. i'm gonna test the pressure reg and the iac and adjust the stop screw.
whats got me confused is how any of these possibilities for the idle not behaving could be making my tapping noise
:headscratch:? any ideas?
so a couple days ago while i was out the mustang just up and died while idleing, rpms dropped to 400 and it quit. he started right back up. after that, he got worse; wanted to idle really low at about 600, i had to do the two foot thing to keep the rpms up at 800 because i didnt want it to die again. as i'm going home it seemed like it was making less power than normal, not a huge difference but enough that i noticed. i started him up and he hasnt died at idle since, but the rpms will start out high going up to 1500 for about 20-30 sec, then dropping and staying in the 600-800 range. and then i hear a tapping comming from the engine. it seems like its in the head or throttlebody, but i cant pinpoint its exact location. it tapps more as the engine rpms go up, at least it does while parked with me pulling the throttle by hand, its too noisy while driving for me to tell if it taps or not. pulled the hose from the fuel pressure regulator, and it did smell mildly of fuel. it has plenty of clean oil in it, and the dummy gauge in the dash reads about 2/3rds.
i checked timing and the cam and crank marks line up 100% perfect. air filter is clean. i just regapped the plugs and they were only a little bit off and they looked completely perfect. the head is new with less than 2k on it. i sprayed the maf with maf cleaner and it didnt change anything. engine off and engine running gave the same two codes; 172 (o2 sensor says running lean) and 332 (insufficient egr flow), i also got a 116 for the ect, but i replaced it a couple weeks ago.
about a year and a half ago i took out the pcv and capped off the crankcase hose and the egr. it was supposed to be temporary, but i sorta forgot about it. i'm gonna try and clean the iac, but i'm having trouble getting the bolts to let go without stripping the heads. i'm gonna try changing the fuel filter too. the icm and coil packs are less than 2 months old, and the plug wires are only 2 years old. i'm gonna test the pressure reg and the iac and adjust the stop screw.
whats got me confused is how any of these possibilities for the idle not behaving could be making my tapping noise
:headscratch:? any ideas?1 - 6 of 6 Posts
1 - 6 of 6 Posts
