Running Way Too Rich

5.0ttops87 · Apr 28, 2017

So my 87 gt has a e303, gt-40 intake, 1.7 rr, new lifters (stock replacement), hardened pushrods, shorty headers.. I've tried a million different things here.. I've gotten the car timed to a 10 and plugged the spout connector back in and it ran fine till i tried to drive it and once it warmed up or ran longer it only seemed to idle worse (not just lope.. surge off and on).

Things I've already replaced/checked -

*New Cap/rotor (msd)
*Tried a few different pair of spark plug wires...
*New spark plugs (NGK G-power)
*Checked voltage on Throttle Position Sensor (.98 closed - 3.4 open all the way)
*Vacuum to Fuel Pressure Regulator (and a few month old fuel pressure regulator in the car)
*New vacuum line to MAP sensor (good vacuum there)
*New/used fuel injectors (stock 19# off ebay.. I tried 30# and it really ran rich as heck)

Side note - I know its running pig rich because it'll foul plugs pretty quickly.. and it burns my eyes with smoke in the garage..

Also I do not have the O2s hooked up yet.. I know this could be helpful but i haven't had time to take my xpipe in to have new bungs welded in.

Any suggestion?

5.0ttops87 · Apr 28, 2017

I don't quite get how people say to dump the codes on the computer... but I do have a scan tool for my car..
Codes Pulled - 22- Manifold Absolute Pressure (map) sensor out of range... I checked the vacuum and such.. it seemed good.. it wasn't getting any before i replaced the line.. but is good now....
54 - Intake Air Charge temperature sensor circuit open/vaine air flow out of range
85
10
18 - SPOUT circuit open or Spark Angle Word (SAW) circuit failure.. or Loss of Tachometer inpute/ IDM circuit failure/ Spout Circuit grounded

General karthief · Apr 28, 2017

First thing is get those 02's in. Is your temp sensor (not the sender for the gauge) plugged in?
There is a surging idle checklist in the tech/how to section.

5.0ttops87 · Apr 28, 2017

The other stud looking sensor with a wire boot on it.. on the drivers side? or the passenger side sensor.. It's a gt-40 intake so some sensors couldn't be used... at least one of them i do believe.

Dan02gt · Apr 28, 2017

Definitely get the O2s hooked up so the computer can try to optimize the A/F ratio.

When you say that you have the MAP connected to a new vacuum line, does that mean that the car hasn't been converted to mass air? If it's still speed density you will never get it to run right with that E cam.

5.0ttops87 · Apr 28, 2017

Dan02gt said:
Definitely get the O2s hooked up so the computer can try to optimize the A/F ratio.

When you say that you have the MAP connected to a new vacuum line, does that mean that the car hasn't been converted to mass air? If it's still speed density you will never get it to run right with that E cam.

I have the stuff to swap for a maf but not enough time or patience currently.. and the car should still be able to hold its own with the cam either way .. before i pulled the lifters and replaced them I had a guy help me put the cam in prior to these issues.. he had my rockers set with lash and the thing still ran fine.. lol I know thats not right so .. new lifters.. preload on valves and the car has issue with running rich... I should also say the car ran okay without the o2s before too.. I do plan on having them installed soon though.( i know its a big part of the closed loop that the computer puts itself into and I will get them in very soon)

General karthief · Apr 28, 2017

5.0ttops87 said:
The other stud looking sensor with a wire boot on it.. on the drivers side? or the passenger side sensor.. It's a gt-40 intake so some sensors couldn't be used... at least one of them i do believe.

The temp sensor is located in the metal heater tube that runs down the passenger side of the engine, if you don't have the tubes then get a thermostat housing that has a threaded hole in the top and install it there.
The sender with the single post in the drivers side of the intake is for the temp gauge.

5.0ttops87 · Apr 28, 2017

Dan02gt said:
Definitely get the O2s hooked up so the computer can try to optimize the A/F ratio.

When you say that you have the MAP connected to a new vacuum line, does that mean that the car hasn't been converted to mass air? If it's still speed density you will never get it to run right with that E cam.

I've been very stubborn about not replacing it because part of it requires pulling the driver seat and tapping into more wire than i like to lol but I think I'm gonna take the advice and get on it and stop screwing around with the speed density junk.

5.0ttops87 · Apr 28, 2017

karthief said:
The temp sensor is located in the metal heater tube that runs down the passenger side of the engine, if you don't have the tubes then get a thermostat housing that has a threaded hole in the top and install it there.
The sender with the single post in the drivers side of the intake is for the temp gauge.

Yeah I got that sensor there sorry I'm not looking at the car now had to think back .

5.0ttops87 · Apr 28, 2017

ordering a new maf conversion harness from lmr and going to install that as soon as i get it and see if a maf computer i got doesn't handle this crap better like you're saying @Dan02gt 50 dollars to get rid of head aches then some more for o2s if i cant ever break my old ones free. lol

General karthief · Apr 28, 2017

Buy new, start fresh

mikestang63 · Apr 28, 2017

E303 on a SD car?

5.0ttops87 · Apr 28, 2017

mikestang63 said:
E303 on a SD car?

lol yes! it worked before.. lol with a lot of clatter and lash on valve springs (really didn't lope) and yeah... I really hate messing with the wiring on this car... I'll give in now.. I'm tired of the temper mental SD...

a91what · Apr 28, 2017

SD works well within the parameters it's tuned to.

The IAT sensor is supposed to be in the #5 runner on the drivers side. If the pad is not tapped for the sensor you have a few options.
#1 drill and tap for the sensor
#2 plug the sensor in and leave it laying on the intake next to the fuel rail
#3 put the IAT sensor in the air box and extend the wiring over to that location.

FYI the IAT information directly affects fuel trim and is used to adjust timing under high temp conditions. You need it hooked up

5.0ttops87 · Apr 29, 2017

a91what said:
SD works well within the parameters it's tuned to.

The IAT sensor is supposed to be in the #5 runner on the drivers side. If the pad is not tapped for the sensor you have a few options.
#1 drill and tap for the sensor
#2 plug the sensor in and leave it laying on the intake next to the fuel rail
#3 put the IAT sensor in the air box and extend the wiring over to that location.

FYI the IAT information directly affects fuel trim and is used to adjust timing under high temp conditions. You need it hooked up

and that would probably be the one left in my old intake that has no spot on the gt-40.. thank you again.

Mustang5L5 · Apr 29, 2017

Just extend wiring and mount it in the air box

5.0ttops87 · Apr 30, 2017

Mustang5L5 said:
Just extend wiring and mount it in the air box

will do .. but i have a cold air so ill need a bung welded to it i suppose. I don't think its thick enough to tap lol

Mustang5L5 · Apr 30, 2017

I wonder if they make a 3/8" npt bulkhead fitting?

5.0ttops87 · Apr 30, 2017

Mustang5L5 said:
I wonder if they make a 3/8" npt bulkhead fitting?

hmm I don't know I guess I've never really messed with these types of fittings.. I'll look around for something to make it work.. I rather use my cold air intake since i got a good filter on it.. but if not I still have the factory air box.

General karthief · Apr 30, 2017

Could you find a nut, plastic maybe, that fits the sensor and use that with a washer to mount it in the intake tube?

Running Way Too Rich

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wonder how much it would cost to ship you a pair

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mazing how much gas smell came from that tiny hole

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wonder how much it would cost to ship you a pair

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wonder how much it would cost to ship you a pair

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SendMeUrDataLog

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That is…until I whipped out my Bissell

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That is…until I whipped out my Bissell

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wonder how much it would cost to ship you a pair

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