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Everything posted by Fairtax4me
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If it has it, check the large hose, about 1" diameter, that runs from the idle control motor to the intake tube. Also make sure the breather hoses that run from the valve covers up to the big airbox are connected. There may be another that comes from a Y by the PCV valve to the airbox. The airbox itself is two parts and can be difficult to get back together if taken apart. And check the clamps at each end of the intake tube, and the clamps between the throttle body and airbox. Those are the usual causes for engine stalling. Did he replace the cam seal?
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There are some sharp corners in the dash right around the lighter plug. Might pull the panel out and check the power wire. Are any aftermarket accessories installed in this car? A lot of people like taking power from the lighter plug circuits and they usually pull too many amps when something is plugged into the socket because of it. Could also be a stray wire from a previously installed something or other that was removed and they just left the damn wire hanging under the dash. When I bought my truck (85 ranger) the previous owner had wired up god knows what and pulled all of it out before trading the truck in. Which is fine, except he left bare wires everywhere. One of those was attached to a light switch (single pole house light switch) laying on the floor, not attached at all, that was wired straight to the battery, through a sharp hole drilled in the firewall with no grommet, with NO FUSE!
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Does it have the filter mount oil cooler? I'm not sure which years had those but the cooler is mounted to the bottom of the engine and the oil filter screws on to the bottom of the cooler. The cooler uses antifreeze so there are two coolant hoses going to it. One of the hoses could be loose or split on the end. Double check that before blaming head gaskets. Next guess would be that it could be a leak from the upper radiator hose that's running down the front of the block and dripping down by the oil filter.
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BKR6E-11 is the V power copper plug with the same heat range. They'll work just fine, but you may need to re-gap them after 15 or 20 thousand miles. Spark doesn't jump the plug gap quite as easily with higher cylinder pressure that the turbo creates. This is overcome by closing the gap a bit, but as the plug wears the gap widens and can cause misfire issues under boost. The iridium tip plugs are more resistant to this problem over the long term, but they cost about 3-4 times as much. If you don't mind pulling the plugs every now and then, standard copper should work just fine.
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You got it backwards. 140 ft-lbs of torque is exactly 140 pounds of force applied to the end of a 1 foot lever. Your mechanical advantage is that you use a 2 foot breaker bar to turn the bolt, so you only push with 70lbs of force, 2 feet from the center of the crankshaft. The hole in the flex plate is only about 6 inches from the center of the crankshaft (if that). 140 ft-lbs at half of a foot means the force applied to the screwdriver doubles. The screwdriver has to hold 280 lbs. A good screwdriver is able to hold this. A cheap Chinese screwdriver may break.
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Grinding noise? Either the brake pads are completely shot or the wheel bearing fell apart. Either way you have multiple problems here. It probably needs a new master cylinder. Probably needs new pads, possibly a wheel bearing. Check the condition of ALL of the pads and rotors, and check ALL of the wheels for up & down and side to side movement. The caliper slide pins tend to get rusty and seize which prevents the caliper from moving as it should. Remove the calipers and inspect the slides, clean and regrease them with high temp brake grease. Replace them if they're very rusty or pitted or scored. Check the rotors for rust. Rust on the surface where the pads contact the rotor will just chew the lining off of the pads which will leave wide grooves in the lining. This decreases braking ability, because the rusted parts of the rotor never actually make full contact with the pad. If this is the case the rust can be sanded or wire brushed off in some cases so that new pads will make full contact with the rotor. Often the rotors need to be replaced, and new brake pads installed. If the brake fluid has not been changed in the past two years, that needs to be done.
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I'm sure the ECU could figure out crank and cam position from just one sensor, but having two gives it something to check against to determine if the timing is out. There was a thread a few years back where someone was playing with adjustable crank sprockets with the thinking that it would affect ignition timing. Not sure whatever came of that. I'll have to see if I can find it again. Bad crank sensor will prevent the engine from running. An intermittent failure or poor connection to the sensor could allow it to still start but you will have a stored code because the ECU needs that signal. Usually with crank sensor failure it's all or nothing. It either runs or it doesn't. The cam sensor may be the same way. Easy to find out, just unplug it and see if the engine starts.
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Frankenmotor question. Searched.
Fairtax4me replied to xbeerd's topic in NA Fuel Injection Engine Tech
Sounds like a plan. I'd do it if I had a spare 2.5 laying around. Take pictures! -
Get the timing belt cover off NOW and check the lower cogged timing idler. They like to fail, and they can flap around and toss bearings out all over the place as they chew through the water pump housing right before snapping the timing belt. A broken timing belt on that engine will result in bent valves that end up costing you days of work and thousands of dollars to repair. A new timing belt kit now (with water pump and all idlers) will cost you about $200 on eBay. DO NOT drive the car until you find the source of that noise. The good news is you will probably find the suspected compressor noise is the timing idler.
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I doubt this was an attempt to combat the effects of wasted spark. Somebody had problems with number 1. Probably cracked or broke so they put A new spark plug in, and didn't bother to match it to the type already in the car. The burn mark is where spark is obviously jumping to ground. This could be due to a crack in the spark plug or a split in the boot. Definitely a good idea to replace the wires. And yes, you should put dielectric grease on all of the boots to help prevent moisture breach and arcing. I would have put a set of BKR6E-11 copper plugs in it. It seems to me that the platinum tips wear more unevenly when used with wasted spark systems, but its just a theory right now. I don't like paying $35 for a set of spark plugs that last no longer than the copper plugs that cost $10.
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MAF ground, cycling?
Fairtax4me replied to 86 Wonder Wedge's topic in Old Gen.: 80's GL/DL/XT/Loyales...
White powder = lean mixture. Are only certain plugs coming out white? If its only one or two it could mean a couple fuel injectors aren't spraying properly. Vacuum leaks are also possible. You replaced the throttle body gaskets and that cured one issue, the manifold gaskets could be bad as well. MAF should be grounded through the control unit and it probably will screw around with the ground circuit when it's running. Its kind of a pointless test anyway since the connector is unplugged. Resistance may change when the circuit is loaded, so to get an accurate picture of what's going on you should back-probe the connector while its plugged in. The signal voltage that gets sent back to the ECU is what you should be more concerned with anyway since thats what the ECU uses to determine what change it should make to the fuel mixture. Can't tell you exact specs, but I'm sure that info is around here somewhere. -
You've got a lot more experience tuning than I do, but doesnt the ECU use the cam position sensor to determine the fuel injector timing? Crank sensor for ignition timing?
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Cam timing doesn't greatly affect spark knock. Ignition timing, fuel octane, air/fuel mixture, and combustion chamber design have a larger effect. Higher compression creates more heat prior to ignition, this leads to detonation after ignition when using low octane fuel. Octane is added to help gasoline resist combustion. Ignition timing too far advanced when combined with low octane creates the same effect, you get too much heat in the combustion chamber around the time of ignition. Combustion chamber design is another major factor because the chamber shape affects how much turbulence or "swirl" there is in the air fuel mixture as it enters the chamber. The wrong type or amount of swirl can cause the mixture to be uneven, basically lean in some places but rich in others. The lean parts of the mixture will ignite first, and can do so before the flame from primary ignition has spread across the chamber. More swirl means the mixture combines more evenly, and will then burn more evenly as the flame front progresses. Cam timing can have an effect on the amount of "swirl", but it has to be pretty far out to be detrimental. At that point the compression would also be affected since the valves would close too soon or open too late. I find the numbers you have for total ignition timing advance interesting. I've seen timing advance indicated as much as forty four degrees on the scanner in my 96 Ej22. This only occurs during part throttle cruise, when under heavy acceleration timing advance is usually around 25-30 degrees. When you say total advance do you mean the amount of advance over the base setting? Base meaning ignition timing at idle, which should be about 14 degrees.
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Idle control motor. You can unplug that and it shouldn't affect your re-program. Does your charger not have a high charge setting (like 6-10 amps)? The low settings will hardly even keep up with the draw from the dome lights much less the accessories and ECU. If that's all you have charge the battery overnight, then put it in the car and keep the charger hooked up while you do the download.