I have a 1998 Infinity QX4. I recently had to put a water pump on it which required taking the timing belt off. I put the belt back on going by some info I found online saying to line up the Crankshaft by counting the lines on the bottom pulley from left to right starting at 0, 5, 10, 15, etc. It said to place the pulley lined up on 15 BTDC and I lined up the camshafts with there markings. After putting It back together it runs fine but has a slight miss and sometimes it dies when it is put in gear (it is an Auotmatic) I took it to Auto Zone and had the codes checked and I got P0300 (random cylinder missfire detected) which could be; 1'feul system malfunction,2' ignition system fault,3'Large vacuum leak,4'engine mechanical condition;And P0174 (Feul injection system too lean-bank 2) which could be ; 1' low feul pressure or resttricted flow, 2' Ignition system Fault, 3' Large vacuum leak, 4' faulty MAF sensor. I guess what I need too know is should I tare the engine back down and redo the timing and if so can someone help with a diagram of some kind I have some experience with cars but not any that didn't time at TDC. PLEASE HELP THIS IS MY ONLY VEHICLE!!!!!
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1998 Infiniti QX4
Question: My SUV has a slight miss, Please help
Answer #1Superbob December 31, 2010, 13:11Master
Check for an air leak into the intake system like a loose clamp or split rubber duct. I don't think the timing is necessarily off but you must have another problem causing the miss and lean running.
Here's a directory link for you:
Replyjdean, December 31, 2010, 14:49Rookie
I have checked foor loose clamps and such all I have found is that the air intake duct where it connects to the intake has what looks like a split in it could this be the problem?
ReplyVisitor, March 30, 2011, 06:13
I had a small miss also some years ago. One of the sparks plugs was cracked. I replaced all of them and it has been fine since then. Good Luck, John
ReplyVisitor, April 08, 2011, 10:55
the timing was off but thanks to everyone
Answer #2lrwhat October 26, 2012, 19:28Rookie
your timing is def. off get a cert, mech to fix that prob. before your engine is shot. sorry about that i just noticed you repaired it already.