1990 toyota pickup running lean,bored 30 thosands,high compression pistons 10;1 ,performance cams,headers dual exaust,NO EGR ? Will the x3 performance chip solve my problem.

Doesn't have EGR valve . How many miles on the truck ?
What Causes High NO (NOx)? Nitrogen Oxide or NO is created when an engine's combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitric oxide emissions. Below are common failures which may cause your car, truck, van, suv, or motorhome to produce high high nitric oxide. 1. Lean Fuel Mixture - Lean fuel mixtures cause high NOx. A lean fuel mixture exists when less fuel then required is delivered to the combustion chambers or when more air then necessary is added to the fuel. In either case the lack of gasoline needed to cool the combustion chambers down is not present. Combustion temperatures increase causing high nitric oxide emissions. A lean fuel condition may be due to a vacuum leak/s and/or defective fuel control components, such as the Air Flow Meter, Engine Coolant Temperature Sensor, and O2 sensors. Read about Oxygen Sensor.
2. Defective EGR System- The Exhaust Gas Recirculation system is designed to reduce NO. The EGR system consists of an EGR valve, EGR pressure sensor, vacuum hoses, and one or more vacuum switching valves or solenoids. Later model vehicles may be equipped with electronically controlled EGR valves, which do not require vacuum lines or switching solenoids. Electronic EGR systems will have these components built in.
The EGR system's job is to re-route a small amount of exhaust gas back into the intake manifold to help reduce combustion chamber temperatures. As mentioned above NOx is created when combustion chamber temperatures reach above 2500F. By recirculating exhaust gas back into the intake, a small amount of the air/fuel mixture is replaced with inert gas, reducing combustion temperatures. Read about EGR System.
Regular Smog Check STAR Smog Station Smog Check Repair Mile: 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 30 Which Type Should I Choose? > " name="submit" style="font-size: 16px; font-weight: bold; border-radius: 0px; border-width: 0px; border-style: solid; border-color: rgb(51, 127, 237); padding: 2px 10px; background: -webkit-gradient(linear, 0% 0%, 0% 100%, color-stop(0.05, rgb(61, 148, 246)), to(rgb(30, 98, 208))) rgb(61, 148, 246); color: rgb(255, 255, 255); min-width: 195px; min-height: 30px; text-shadow: rgb(21, 112, 205) 0px 0px 0px; box-shadow: rgb(151, 196, 254) 1px 1px 0px 0px;">

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• Failed High HC Emissions
• Failed High CO Emissions
• Failed High NO Emissions

3. Defective Catalytic Converter (CAT) Some vehicle manufactures have designed their cars to operate without EGR valves. Non-EGR equipped vehicles rely heavily on the Catalytic Converter to assist in the reduction of NO. These vehicles have tendencies to develop CAT problems sooner then those which are equipped. If you own a non-EGR equipped vehicle, and have failed the emissions test for high NOx, pay close attention to the Catalytic Converter. Read about Catalytic Converter
4. High Engine Mileage - Over an engine's lifetime, carbon build-up develops in the engine's combustion chambers. The more miles on your engine, the more carbon build-up on the pistons, cylinder heads and valves. Carbon build-up decreases the available space for the air/fuel mixture to combust, and causes higher cylinder compression. High compression results in high temperatures and high NOx. Keep in mind this problem is usually seen in vehicles with over 150,000 miles which have been poorly maintained. The solution to this problem is called De-Carbonizing. It usually costs around two labor hours at a smog check repair station. It will remove a good amount of carbon out of an engine. This will increase combustion space, lower compression and lower NOx.
5. Engine Overheating - Inadequate engine cooling can will high NOx. If your vehicle's cooling system is not working efficiently, (i.e. bad radiator, thermostat, hoses) high NOx will be created. Remember high NOx nitric oxide is created when an engine's combustion chamber temperatures reach over 2500F. You will want to make sure your vehicle's cooling system is working properly, and your vehicle's temperature gauge is always indicating normal.

Here is Holden\'s Alloytec V6 in glorious technical detail.



The global V6 engine is the first V6 engine program to address what Thomas G. Stephens, group vice president, GM Powertrain, says is a vital initiative: to develop world-class engines with fully contemporary features - such as dual overhead cams and variable valve timing - but at a competitive cost structure that allows use of the engines in a global mix of vehicles.



Exhaust: 111 degrees BTDC initial timing

50 crankshaft degrees retard authority



Compression Ratio:10.2:1



Bore Centers:103 mm



Firing Order:1-2-3-4-5-6



Fuel Shutoff:6,700 rpm



Engine Idle Speed:600 rpm



Fuel System:Sequential port fuel injection (returnless)



Engine Management:Torque-based; Bosch Motronic ME 9 32-bit micro-hybrid controller



Intake Manifold:Dual-plenum, equal-length with 2-position variable volume control (resonance tuned)



Throttle:68-mm single bore; electronic control (ETC)



Ignition:Individual coil-on-plug; individual cylinder knock control



Fuel Requirement:Premium fuel recommended



Emissions Controls:Dual close-coupled catalytic converters (1.15L ultra-thinwall ceramic)

Positive crankcase ventilation (PCV)

Intake- and exhaust-cam phasers (EGR)

Evaporative emissions system



Assembly Sites:St. Catharines, Ontario, Canada

Port Melbourne, Victoria, Australia

Material Applications



Block Material:Aluminium, precision sand-cast 319 with cast-in-place iron liners



Cylinder Head Material:Aluminium, semi-permanent mould 319



Intake Manifold:Upper: Aluminium, sand-cast 319

Lower: Aluminium, 356-T6



Exhaust Manifold:High-silicon moly cast iron



Camshaft Covers:Injection compression thermoset composite; vibration isolated



Front Cover:Diecast 380 aluminium; internal multilayer damping panels



Crankshaft:Forged steel



Connecting Rods:Sinterforged steel



Pistons:Aluminium, polymer-coated skirts, full-floating wristpins



Main Bearing Caps:6 bolt caps, copper-infiltrated sintered steel



Oil Pan:Structural diecast aluminium, steel windage and baffle plates



Additional features:Pressure-actuated piston-cooling oil jets

Extended-life sparkplugs, coolant, accessory belts

Cartridge-style, top-access oil filter

Oil-level sensor

Wide-range oxygen sensors

i love that post.
yes, anytime the engine does not combust 100% ,heat blows out the exhaust big time. (EGT sensor will; prove that ,every time) ask a pilot.

1: misfire.
2: fuel mix wrong.
3: spark bad
4: burn exhaust valves, (compression tests , done deal )
5: limphome mode, CEL glowing running, worse (USA) flashing..
6: EGR valve Failure and pinging now. horror. that...
7:"cam timing slipped, belt or chain.
8: spark timing way off.

at the least.

If you want 300hp out of your 318 this will get you there: Bowl port the heads and have the valves back-cut 30*, Edelbrock RPM intake(Airgap is more money and the rpm and rpm airgap are basicly the same), Any 600cfm carb, Comp 20-309-4, Headers and dual exhaust. This combo will give you great bottom end and will make 300hp.

The cam, intake and carb alone will not get you there, you need more head flow. So bowl port the heads, or install some 360 heads. good day ! or is this a bit much !!
the 1973 Mopar 318 has 150 hp at 3,600 rpm.

Check for a malfunctioning EGR valve. This valve is only selected to perform when the engine is warm. It has a vacuum diaphragm which can crack and lead to vacuum leaks. This will cause rough running. The EGR valve should be vacuum checked to see if this diaphragm is leaking. This valve can also stick open due to carbon deposits. When the valve sticks open, the fuel/air mixture is leaned out and rough running ensues. This problem is practically expected on a vehicle of that age.

try ajusting your carb

I suggest you bring the pistons to TDC, one at time on the comprssion stroke and do a "cylinder leakage test". Put compressed air into the spark plug hose and try to detect where the air is going. If you have the piston exactly at TDC, it will stay there when you put conpressed air in the hole, if it's off a little it will push the piston down. If you have the valve cover off you can watch the valves to determine if you have the pistons on the compression stroke. You should be able to buy a fitting from an auto parts store that will thread into the spark plug hole. If not take an old spark plug and bust the guts out of it and weld a pipe fitting to it to adapt your air compressor hose.

Reset the engine timing by first jumping pins E1 and Te1 in the grey box under the hood. If the truck runs poorly set to proper timing, your timing chain has jumped a tooth. Does it rattle bad at idle? Id so, the guides are worn out, and the chain is stretched.

NOx is exhaust gas recirculate related, look into EGR valve function...

They sold you a set of headers that don't accommodate the EGR valve line. You can buy headers that have the bung welded into them for the connection. If you do not connect the EGR then you exhaust gas temps will run high and pinging will likely be the result. Excessive preignition can cause valve and piston damage. The lack of the EGR valve may cause you to not pass your states emissions test. I would purchase a set of headers that have the hook up on them. Try Gibson headers. They sell these.