As I've been babbling in the WAYWO thread, my mark VII certainly isn't running top notch. I know an internet diagnosis is damn near imposable, but I also know some of you guys know your 5.0's damn well.
So what's wrong with it? First and foremost, it idles like crap. The engine visibly shakes as if it's misfiring on 1 or 2 cylinders. It also shakes the whole car like some sort of giant viberater. Under 2k, the car has no power what so ever. If you give it any gas, while it's under a load, it shakes, chugs, and backfires out the exhaust until it reluctantly downshifts. Very annoying. It feels like a total turd until about 2500. Once it hits 3k, it pulls like a freight train and couldn't run better. But it feels terribly slow, like my Tempo could beat it slow. From a dead stop it can't even bark one of the el-cheapo tires on the back, and trying a brake stand just makes the engine miss and studder.
Video of it's slowness in action.
Now personally I think the problems are related to the fact the car has gray top injectors in it. The injector harness has been numbered, so someone was messing around in there. I have 8, 19lbs EV6 style injectors that I'm going to throw in as soon as the rebuild kit arrives, but with my track record I'm sure they won't make a difference. Only mods are the mufflers are rotted out, and the guy says he hollowed out the cats.
One would believe that the gray top injectors could mean someone stuck a lopo in there, but it will barley even run at all with the lopo firing order. Also, the way it pulls at 3k, there's no way a lopo would pull all the way to 5k like it does. Computer code is DX3
So far I have:
Replaced plugs/wires/cap+rotor/coil
New fuel filter
Swapped out my know good IAC
Checked for vacuum leaks, none readily apparent
It pulls a steady 17 inHg at idle
Unhooking the egr does nothing, putting vacuum to the egr kills the engine.
Timing is at 12* bdtc with spout unplugged. Plugging it in makes it move to wherever.
No check engine light
Another thing, the car seems to run better with a vacuum leak. It certainly smooths out the engine.
The car also will not start with the airbox tube removed unless you give it some gas.
The car doesn't stall, but it comes close (and actually once has)
It smells like it's running really rich
Horrible gas mileage @ 14 mpg
So could the possibly wrong injectors cause all of this? I'd assume they'd cause more problems at higher rpms, and less at idle but I could be wrong. I'd just like to have all the bases covered since I know with my luck it's going to be a huge problem.
So what's wrong with it? First and foremost, it idles like crap. The engine visibly shakes as if it's misfiring on 1 or 2 cylinders. It also shakes the whole car like some sort of giant viberater. Under 2k, the car has no power what so ever. If you give it any gas, while it's under a load, it shakes, chugs, and backfires out the exhaust until it reluctantly downshifts. Very annoying. It feels like a total turd until about 2500. Once it hits 3k, it pulls like a freight train and couldn't run better. But it feels terribly slow, like my Tempo could beat it slow. From a dead stop it can't even bark one of the el-cheapo tires on the back, and trying a brake stand just makes the engine miss and studder.
Video of it's slowness in action.
Now personally I think the problems are related to the fact the car has gray top injectors in it. The injector harness has been numbered, so someone was messing around in there. I have 8, 19lbs EV6 style injectors that I'm going to throw in as soon as the rebuild kit arrives, but with my track record I'm sure they won't make a difference. Only mods are the mufflers are rotted out, and the guy says he hollowed out the cats.
One would believe that the gray top injectors could mean someone stuck a lopo in there, but it will barley even run at all with the lopo firing order. Also, the way it pulls at 3k, there's no way a lopo would pull all the way to 5k like it does. Computer code is DX3
So far I have:
Replaced plugs/wires/cap+rotor/coil
New fuel filter
Swapped out my know good IAC
Checked for vacuum leaks, none readily apparent
It pulls a steady 17 inHg at idle
Unhooking the egr does nothing, putting vacuum to the egr kills the engine.
Timing is at 12* bdtc with spout unplugged. Plugging it in makes it move to wherever.
No check engine light
Another thing, the car seems to run better with a vacuum leak. It certainly smooths out the engine.
The car also will not start with the airbox tube removed unless you give it some gas.
The car doesn't stall, but it comes close (and actually once has)
It smells like it's running really rich
Horrible gas mileage @ 14 mpg
So could the possibly wrong injectors cause all of this? I'd assume they'd cause more problems at higher rpms, and less at idle but I could be wrong. I'd just like to have all the bases covered since I know with my luck it's going to be a huge problem.
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