I could not say exactly, however diesel hangs around pretty long and I think it would be noticable for weeks, though I don't know for sure.
The closer to the last run the eaiser it is to see, however just turning the motor over and having fuel pumped through the injectors is all that would be needed.
Ok, I just pulled the front two injectors on the driver's side of the engine after running the truck for about 1minute to move it in the driveway. Both are wet. Not only the tip is wet, but the entire injector pretty much from the threads down. So, I'll be ordering a new set of injectors today, unless someone here tells me different! Thanks!
Given the miles on them, I bet most of them are leaking.
The internals wear, and when the injector should be popping closed after injecting the fuel, it don't seal.
So the fuel continues to leak into the cylinder.
To much fuel and at the wrong time is the result.
Stop to think a minute.
My guess is you have a 4.10 axle, so every mile you drive in fifth gear at 60 MPH that injector is firing 1025 times.
186,550,000 times in 182,000 miles if they were all driven at 60 MPH and all in fifth gear with no idle time.
Add in idle time and driving time below fifth gear, those injectors have probably popped well over 500 million times.
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86 F250 HD 6.9 IDI ATS turbo "not exactly" stock 4x4 T19 BW1345 3.55LS both ends D60 front, 10.25" Sterling rear, ram air, dual stacks.
Just a quick update. I just installed a new Autometer EGT gauge. I installed the pyro in the driver's side exhaust manifold, drilling in from the underside, behind the backmost cylinder, right before the downward bend. I just took it for a quick spin. After letting it get up to temp, pulling a slight (2% max) incline, I saw EGTs of 1250 - 1300 at 60 mph, 2700 rpm, in 4th gear (5 speed manual trans).
I have new injectors ordered, and hope to get them next week. Hopefully, this will give me more complete combustion, and lower the EGTs. However, I am more and more convinced that the exhaust restrictions created by a combination of a stock 2.5" pipe, and a very long run given the extended wheelbase of this truck, are contributing significantly to the high EGTs.
Just a quick update. I just installed a new Autometer EGT gauge. I installed the pyro in the driver's side exhaust manifold, drilling in from the underside, behind the backmost cylinder, right before the downward bend. I just took it for a quick spin. After letting it get up to temp, pulling a slight (2% max) incline, I saw EGTs of 1250 - 1300 at 60 mph, 2700 rpm, in 4th gear (5 speed manual trans).
I have new injectors ordered, and hope to get them next week. Hopefully, this will give me more complete combustion, and lower the EGTs. However, I am more and more convinced that the exhaust restrictions created by a combination of a stock 2.5" pipe, and a very long run given the extended wheelbase of this truck, are contributing significantly to the high EGTs.
Anyone want to chime in on this?
I thought i was running hot, 1250-1300 and the truck is still running.
Hopefully the new injectors will cure this problem, If its still running 1200, you need to back the fuel off. These trucks were always slow and now 182,000 miles it is still slow. Nothing short of a turbo charger will give you much power, and with a turbo charger it will never be a speed demon. However it will run smoother and what power you have will be easy power.
Injectors arrived yesterday. I installed them today. Surprisingly, it took me less than an hour to install all 8. I nicked one o-ring and had a return cap leak, but found that pretty quickly. The excess fuel in the valley where the glow plug sits revealed an air leak around the GP. Tightening that up took care of it.
On test drive, I did notice that I was able to get up to 65-70 a bit faster and hold speed in 5th, whereas before, to hold 60 - 65 required 4th gear. I didn't notice any big improvement in accelleration, but being able to maintain my speed on a slight grade was sure nice.
She still has a bit of smoke, but not as much as before. EGT was about the same, 1250 - 1300, but settled down a bit in 5th once I was up to speed.
I think I'm getting about all that I can out of this old beast now, sans turbo. I'll keep my eyes out for a used turbo and we'll see what happens.
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