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2.9 EGR REmoval


stevealvey24

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What exactly will the truck do if you remove the EGR and dont change the computer over to a no EGR tuning? Just wondering.
 


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adsm08

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Low power and poor economy on the highway. May trash the cats too depending on how you drive and the quality of fuel you have in your area (ethanol content).

If your EGR system is working properly just let it be, it doesn't hurt fuel economy. If it's not, go to the JY and find an 88+ computer and throw it in, it just makes the EGR system inert, preserves your emissions at the tail pipe, and if you have an emissions program in your area, makes it look like the system is there and working.
 

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88+ models have the EGR components there, but they dont actually do anything, or...?
 

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88+ models have the EGR components there, but they dont actually do anything, or...?
No, they just don't have EGR at all. I have an 88 in my yard and an 89 engine in my 87. Neither of those intakes have the EGR port in them. I'm running the 88's computer in my 87 to preserve my tail pipe emissions and NOx content. At least until I can lay hands on a 90 MAF computer.
 

jhammel85

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I'm running the 88's computer in my 87 to preserve my tail pipe emissions and NOx content. At least until I can lay hands on a 90 MAF computer.
Same here. If you want to go EGRless (no real reason if yours is actually functioning as it should, mine wasn't) you'll need an '88+ EEC.
 

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Back in the day I got an EGR block-off plate for a '78 Monte Carlo I had. Made the engine ping like crazy and when I backed the timing off enough so it wouldn't ping, it ran like crap. The EGR block-off experiment lasted about a half hour.
 

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the quality of fuel you have in your area (ethanol content).
I'm assuming by this statement, Ethanol produces more NOx emissions?
 

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I'm assuming by this statement, Ethanol produces more NOx emissions?
No, if the air fuel mix is off because of a missing EGR system that the computer expects to see, a high ethanol fuel may not burn completely, or it may burn too lean and run the exhaust too hot. Either one stands a good chance of melting the cats.

Ethanol is actually less likely to produce NOx since it doesn't burn as hot and NOx can only be produced at temps above 2500* F.

I'm not convinced that even the E-10 is converter friendly. We have seen a lot of vehicles, particularly non-flex fuel 5.4 F-150s, at my shop lately that have needed new cats for no apparent reason. The only thing I can think of is that the ethanol is killing them.
 

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Same here. If you want to go EGRless (no real reason if yours is actually functioning as it should, mine wasn't) you'll need an '88+ EEC.
Yeah, I didn't disable mine because of an EGR malfunction. I put the 88 computer in because mine got wet and I just happened to have that one around to use.
 

87RangerXLTct

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Adsm08 I'm running a 89 2.9 in my 87. Have a 88 computer in it with egr block off plates and vacuum line plugged. It was running great, now I'm trying to diagnose a rough idle upon cold start, I notice wires to the egr solenoid are chewed up, but I'm not sure if this is a problem since with the 88 computer there would be no egr system? Maybe I didn't block the vac lines properly? Red line to egr solenoid is still pushing vacuum?
 

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Red line is manifold vacuum. Green line is switched vacuum.

If you have the 88 computer the EGR wiring does nothing.

You probably have a different issue, unless this started at the same time as the computer swap was done.
 

87RangerXLTct

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That's what I figured. Nope problem just started swapped ecu awhile back. Should I be plugging that red vacuum line?right now it's still attached to the solenoid. The green line that went to the egr is plugged/capped off.
Probably a different vacuum leak or IAC valve I'm thinking.
Thanks for the help man, happy holidays!
 

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If the red line is still hooked up it is plugged.
 

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If the red line is still hooked up it is plugged.
I have an 87 and I removed the egr completely. I blocked the egr port on the manifold. I am running a non egr ecu. Other than the obvious low power of a 2.9 it runs pretty good. When I had the egr setup, I could never get the ecu to not have the error nor idle smooth.

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Red line is manifold vacuum. Green line is switched vacuum.

If you have the 88 computer the EGR wiring does nothing.

You probably have a different issue, unless this started at the same time as the computer swap was done.

I have a 86 ranger, 2.9, auto, 2x4. egr tube was leaking and rattling around so I did an egr delete, blocked off manifold and intake, plugged egr vac line, and unplug egr Purge solenoid and vac sensor. A coworker gave me a used 1988 broncii ecm off 2.9 auto. (At least that's what he thinks it from) and the truck isn't happy, mainly idle rpm after 5+ minutes settled at around 1000 and wouldn't come down unless in gear. (Before it was a sloppy 800 at idle warm). No codes tho. I checked for voltage at egr vac purge solenoid and found around 5v at the vac sensor and 13v at purge solenoid. Should there be no voltage here if the ecm is truly an 88+?
 


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