ok guys i got a new symptom, i just put a header on my truck despite it running like .

well i popped the hood after letting the truck warm up and the pipes coming from cylinder 1 an 2 were cherry red, what causes this problem running lean?

 

running lean will heat up the pipes, yes. It's also very "no bueno" on the piston rings.

Sounds like an air leak in the intake manifold in the front, possibly the gasket.

 

it has new gaskets, i rebuilt the top end about six months ago maybe longer. so i dont think gaskets can fail that quick. any more suggestions i need to get this thing fixed ive been fighting it for a long time now

 

gaskets can 'fail' at installation. It's not uncommon for this to happen, even to someone who does engine R&R work daily.

FYI, to diagnose an air leak, get a can of WD-40 or starter fluid (ether) and spray short bursts at assorted areas you suspect of leaking, waiting a minute between each spot just to be clear.

The instant the engine smooths up after a shot, you found the problem.

 

ive tried that there is no leaks present. im thinking the injectors might be bad

 

come on guys i need some info

 

If the injectors were bad, they'd be more prone to failing at upper RPMs.

 

i no this is probably a stupid question but could and exhaust leak cause it? cause i have a little one around were the air injection for the pair system, were it bolts up.

 

If your sure you don't have a vac leak, I'd say you have a bad injector. I just changed the ones in my truck due to huge lack of power, and the two rear cylinders running leaner than the front two according to the plugs. (the front two looked normal, the rear two picked up all most no color) But I had so many other problems at the same time, I can't tell you for sure what what cleared it up. I had a few vac leaks, a bad fuel pressure regulator(had fuel in the vac hose to the regulator) a really wore out timing chain, and a felpro throttle body gasket that didn't fit right, and left a huge leak at the bottom of the throttle body.

I'd say if your number one is running that lean, you have a air leak, or maybe a bad injector on that hole. I wouldn't run it like that very much, that amount of heat is hard on a motor.

 

number 1 and 2 are running lean, thats the only two pipes from my header that are glowing wen it runs,

 

You should be right about the injectors. Had the same problem with my truck. The fuel filter was full of dirt and made it gum up my injectors when the dirt bypassed the filter.

 

The injectors are working, that's why the pipes are glowing red. If it is weak injectors, they aren't very weak. Your getting lots of fuel, or you couldn't get enough combustion to heat to get the pipes.

I'd look at the intake track for a vac leak. It might be at the seals for the injectors.

 

ive checked for vac leaks there is nun present, the truck has all new vacum lines and new injector o rings and seals

 

If your sure you don't have a bad gasket, or maybe a bad seal on your injectors. I think you need to start looking at the valves.

Aren't you getting a lean code from the ECU??

 

yes, why would i need to look at the valves? it has a brand new head

 

ok right after i got the truck back together i had a leaky injector due to a cut o ring so i put new seals and o rings in and it stopped leaking and it ran fine, so i don't think its a leaky injector, i no what runs like wen the injectors leak.

 

Your either getting to much air to number one and two, or your letting combustion gases out to fast.

Basically your not sealing on the intake and letting to much air in, or letting the boom out.

If you were not getting very much fuel, the holes would be cold, not way to hot. If your getting way to much air and all most the right amount of fuel, things will get REALLY hot.

How does it drive in the upper RPM's? Is it a sick dog, or fairly normal?

 

its fairly normal,

 

I know you don't think you have a vac leak, but the the info your giving says you do.

if you had a weak pair of injectors, that truck wouldn't get out of the way of it's own smell!
Same thing if you were having valve sealing troubles.

Vac leaks tend to be overcome with RPM's to a point. It's still lean, but not as much as it is at a idle. To give you a idea of what I mean, I had a huge vac leak at the throttle body on my truck. When you fired it cold, it would run fine on the cold start injector, but as soon as it dropped out of the mix things went bad. It shook like a dog pooping razor blades, missed, and would try to die if you let out of the throttle to fast. it would all so run ok at driving speeds.

You can check your TPS and O2 sensor, but if they were off, I would expect to see all holes running lean.

 

For a lean problem its either too much air or not enough fuel. Timing light checking for spark idea would have nothing to do with it. Im not too familiar with the RE, but does it have an IAC? If it does it could be stuck open at idle, its a common problem. It would mean very bad/missing idle, but cleaned up in the higher RPMs.