Exhaust manifold still glowing.

Thanks. So his replacement manifold is not OEM as he was told it is. Good info.

 

I clicked that link and it just brought up the store locator. I am using a phone, however.

 

Here is the part number,

1999 Toyota Truck Tacoma Prerunner 2WD 2.7L EFI DOHC 4cyl
Part Number: 674-464

Autozone's site uses cookies for the local store so that's why you are being asked to locate a store first. Once it's saved the link should work. Or search for the part number.

When I searched for 1st gen exhaust manifolds the only one they carry is for the 4cyl 2wd Pre-Runner. So I'm assuming that's what you have if you went to auto-zone.

 

so it the truck doing anything bad besides the manifold glowing?

i think your chasing a issue, that really isnt even an issue.

 

Only the aftermarket manifold is glowing, which came from Autozone.

 

im guessing theres another thread somewhere that came first?

im just thinking that if everything is in spec and its running fine, its almost like guys that are trying to fix their exhaust on their yfz450s from glowing...

im mostly thinking aloud here so take what im saying with a grain of salt.

 

This^^^^^

Get a Part Yard manifold and I'll bet you will see the difference. By the By...was it lighter than your original by chance?

 

Yes there is another thread. He's running super rich as well.

The thing is, only the new manifold is glowing. Which isn't a big deal but he's not doing super long runs and if its glowing on short runs I couldn't imaging what would happen on a long haul or while towing some weight.

I used to work at vato-zone, seen manifolds come back because they were 'shit' as the customer stated. We never asked why, and now I know.

 

That's why I asked if anyone knows how hot one is supposed to get when operating normally. It's a dark red, not bright or cherry-like. Can't see it in the daytime.

 

So it glows red, but not bright enough to see during the day? I would think that the aftermarket manifold uses a thinner metal than the factory does. Common thing with the aftermarket to keep costs down. The casting process is not always perfect.

However, that being said, I have seen many manifolds, even stock ones, that have a bit of a "glow" to them after long highway drives. Typical causes of an excessively hot manifold would be running rich, restricted exhaust (Remember, even a small restriction can cause excessive heat, while still making the engine "feel" like it is running fine. I think if you just disconnect the cat and let it flow out the exhaust outlet pipe, then do a normal drive, would be a good idea. It will be loud of course, so don't rag on it or be rude to neighbors or others, but just drive it like you normally do at night, then check to see if the manifold is glowing or not.

 

most of the replaceable parts on vehicles are not made by the auto manufacturer themselves, they are outsourced just like anything else. So if you can figure out which company supplied the manufacturer with the part you can go buy it from a part store usually cheaper than the dealer and get the same part. For example alot of the drivetrain components on Toyotas are supplied by Aisin, u-joints are probably spicer, and I believe alot of the electrical is Denso so you figure out the part number and go do some shopping and end up with the same part for less alot of the time.

I don't know on stuff like manifolds if they are built in house or not, but I'm pretty sure the OEM is not the $100 Dorman you get at oriellys. I still put my money on the cat though, I wouldn't junk the manifold just because it gets hot like some have said. I've seen many manifolds turn red over the years and still be fine.

 

If you are defining original equipment (OE) as a clone part thenyour truck is made of clone parts. OE is what you buy when you go to the dealeror a supplier legitimately selling a part in one.



OEM can and is used interchangeably with OE but can mean a part made by theoriginal supplier to the vehicle manufacturer but will not have the markingsof the vehicle manufacturer.



Bought an AISIN water pump for a 22RE and right where the original said Toyotathe AISIN part was ground down but it had more casting flash.



Aftermarket can mean cheaper sub-par parts but not always since I recently cameacross a BMW head where the aftermarket part corrected some of the flawsinherent to the original.

 

First, the aftermarket 'OE style' manifolds are mostly all made in china. I have a Dorman replacement that so far has been running well. If it glows, I wouldn't know cause I have the heat shield on.

Second, Autozone doesn't sell any OEM Toyota parts at all. They may have Denso spark plugs, but that's about it. Also, with the coupon codes available at Advance Auto, why would anyone but ANYTHING from Autozone. For example, for my replacement Dorman, rockauto had the manifold for $95 + shipping, Autozone and Advance had the same part with their markup for about $145 + tax. I used one of the Advance coupon ($50off $125) and got the manifold the same day for right around $100.

Third, OP, fix your running rich problem before replacing the cat or manifold.

 

Wrap a couple of hot dogs in foil and lay 'em on the manifold. If they're cooked after a short drive I'd go back to original equipment.

 

Camera + tripod + open shutter = good night pic of glowing manifold.

I saw a DIY vid once that stated if you have a lamp that has a screw on lampshade (the nut at top to hold it in place), the threads of that screw will match the threads on the camera for a tripod. So, you could set a lamp down and screw the camera into the top - instant tripod. now just set it for long exposure and you got yourself a pic to post.

 

It varies, depends on who the OEM supplier was and if they also deal in the aftermarket.

 

This is what I thought it was.

Or too much boost
https://www.youtube.com/watch?v=RgPHKwoo8fk

 

A rich mix if any thing will make a manifold run cooler it reduces cylinder temps the cat will get hot from a rich mix but not the manifold. This is the reason piston air craft have either air/fuel meters or exhaust temp sensors to avoid cooking engines from a lean mix. It is a steel manifold rather thin I have seen cast manifolds glow and have seen a whole lot of headers glow. The after market most likely is not up to par with an OEM take it back and complain take the money and run and go buy the real thing.

 

Depends on the timing. If the exhaust timing is off, fuel good be escaping the combustion chamber unburnt and igniting in the manifold.

OP, do you have any NOx numbers for your truck, do a recent SMOG test?

 

Don't have the numbers in front of me, but if those fuel trims are right where they should be,,then it's a worry for nothing.

Chassis dyno will show it bright glow in the day,,if it is way off.