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Old 11-11-2019, 06:30 AM
cafournet cafournet is offline
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Default Cherry red manifold

Hello all,*

Need some advice regarding the attached pictures. As you can see my exhaust manifold/turbo hot side is gettingwaaaay too hot. (Believe me or not, this was literally driving 10 minutes around my neighborhood at speeds 30-45 mph.) Engine coolant temperature was only at 170-180 Degrees F whenever picture was taken. Don’t think I need to provide the information for the exhaust manifold temperature, but it was 800+ F from a hand held temperature reader (probably hotter but I didn’t want to get too close).*

A little back ground.. this is my 1985 Ranger with a 2.3t swapped engine from ’88 t-bird. When accelerating out of 1st gear it does feel slightly sluggish upon take-off. I have read around that maybe my timing is retarded some (articles saying timing being retarded could cause the exhaust manifold to become cherry red), anyone have any opinions on this? The engine is not backfiring or anything when driving or idling, which is why I never considered the timing being off some before now. It runs very well actually, besides the as mentioned above when taking off. But certainly if it isn’t timing being retarded, it has to be some kind of restriction after the exhaust manifold (new 2.5” pipes and muffler installed 2 months ago, so I doubt it’s that) or maybe running too lean? My A/F ratio is a little lean, when started it will be anywhere from 18-20 and once its’ warmed up some it sits around high 14’s and low 15’s. Sometimes it will bounce up around 16-18, not sure why. Fuel pressure sits steady at 36 psi. *

I ran a scanner on it. Codes were: 34R and 41R.. 34R is with the EGR (book is very vague on this) , but the thunderbird only has a solenoid (no EGR position sensor on the valve itself) so maybe the solenoid is bad? 41R is the engine is running lean. Which I already knew from my gauge. *

IMG_3587.jpgOnce again.. thank you for your opinions. Let me know if any more information would be helpful.


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  #2  
Old 11-11-2019, 01:51 PM
djfllmn djfllmn is offline
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Default Re: Cherry red manifold

Quote:
Originally Posted by cafournet View Post
Hello all,*

Need some advice regarding the attached pictures. As you can see my exhaust manifold/turbo hot side is gettingwaaaay too hot. (Believe me or not, this was literally driving 10 minutes around my neighborhood at speeds 30-45 mph.) Engine coolant temperature was only at 170-180 Degrees F whenever picture was taken. Don’t think I need to provide the information for the exhaust manifold temperature, but it was 800+ F from a hand held temperature reader (probably hotter but I didn’t want to get too close).*

A little back ground.. this is my 1985 Ranger with a 2.3t swapped engine from ’88 t-bird. When accelerating out of 1st gear it does feel slightly sluggish upon take-off. I have read around that maybe my timing is retarded some (articles saying timing being retarded could cause the exhaust manifold to become cherry red), anyone have any opinions on this? The engine is not backfiring or anything when driving or idling, which is why I never considered the timing being off some before now. It runs very well actually, besides the as mentioned above when taking off. But certainly if it isn’t timing being retarded, it has to be some kind of restriction after the exhaust manifold (new 2.5” pipes and muffler installed 2 months ago, so I doubt it’s that) or maybe running too lean? My A/F ratio is a little lean, when started it will be anywhere from 18-20 and once its’ warmed up some it sits around high 14’s and low 15’s. Sometimes it will bounce up around 16-18, not sure why. Fuel pressure sits steady at 36 psi. *

I ran a scanner on it. Codes were: 34R and 41R.. 34R is with the EGR (book is very vague on this) , but the thunderbird only has a solenoid (no EGR position sensor on the valve itself) so maybe the solenoid is bad? 41R is the engine is running lean. Which I already knew from my gauge. *

Attachment 154871Once again.. thank you for your opinions. Let me know if any more information would be helpful.


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  #3  
Old 11-18-2019, 11:02 AM
tomw0 tomw0 is offline
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Default Re: Cherry red manifold

I think two things can cause cherry red manifolds. Make that 3.
One is late ignition timing, causing some combustion to occur in the manifold.
A rich mixture can do the same.
Running for a long time at high load/rpms can also heat up the manifolds.

Check your timing, and check the O2's in the exhaust. No O2's and you are too rich, as they are all burned up with no spares... more fuel than Oxygen, more or less.
The MAP sensors used in the bird actually measures pressure. If diddled, it will allow higher turbo pressure. Don't be tempted unless you have extra sets of pistons, rods and rings, perhaps blocks...
If it is broken it may meddle with other things. EEC-IV has to know the turbo pressure, temp, rpms, etc to calculate fuel flow during low load or when boosted. Make sure your timing is right on, or it will be mislead. It also needs coolant and air temps... two sensors that are checkable.
tom
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