Intake Questions

stykthyn · May 16, 2012

Any number of things can cause that. At this point I would focus 100% on trying to get codes.

a91what · May 16, 2012

I will work on it again this fri. its going back under the cover till then. One thing i have not looked at is the ignition system, has a new coil, but about 4k miles after the break in it had eaten a cap and rotor. The cap had tons of carbon on the post's it was so bad the car would not run. I have only driven the car about 3k since then, but the cap is looking pretty bad again, black deposits with white sooty buildup... maybe i have some ionization going on inside the distributor? (this is my fathers prognosis, but hes two states away..) Maybe im getting spark scatter....? It is a stock 21 year old dizzy.
Either way i will get the diagnostic tool and scan the car it will be a good investment.

a91what · May 18, 2012

Ok got the diag tool. cant hook it up it requires that sti port i apperantly cant find... and apparently all my pic files are too large for me to upload...
what wire are supposed to be in the diag port? i think i may have a international model which apparently has some diff connectors.
thanx

jsw81 · May 18, 2012

the sti connector comes from the same bundle of wires that the diagnostic port comes from

you can see it on the left of the diagnostic connector in this pic from jrichker's surging idle checklist:

a91what · May 19, 2012

Ok i have looked and looked i even tore apart the harness to see if it was cut back or torn, that extra connector is just not there... from what i see in this pic the connector only has ONE wire coming in on the short row.. The second row has FOUR ports and TWO are used one for the fuel pump and one for the check engine light.
MY connector has TWO wires on the short side of the connector. ie. both ports are used a white wire with a red line and a white wire with a black line ......
The STI connector has a white wire with a red line.... since i have no STI, i can only assume that the "extra" wire in the DIAG connector is the line for the STI the colors at least seem to match from what i have read on the surging idle checklist.
If anyone has an idea or has seen this before i need input so i dont fry my pcm it is brand new
I hope this might clear up any fuzzyness i wish i would have put a carb on the thing now.

stykthyn · May 19, 2012

I have seen before where the grey cover on the still plug breaks off and it gets put inside the test plug. Not saying this is your case but its possible. Fyi a new harness is cheaper than a Carb conversion.

a91what · May 19, 2012

ok i have to know so i might put a burned pcm i have in the car to see if it is the right wire..... its better than burning my new one and beating my head on a wall trying to guess at it....
By the way turned the chip on and fired the car up today ran great no problems no pop just awesome and lots of power....
It was raining the day i was having the poping issue... and now that i think about it the car has a cobra hood with a working svo scoop on it so while its raining water is landing on the dizzy..... maybe having working heat extraction wasnt a good idea...
you think water on the dizzy would cause a missfire???

a91what · May 31, 2012

Ok i tried swapping out the pcm and no luck getting codes but i have no more problems either.. it seems that when its raining or on a humid day i have the issue so i went thru and put dielectric grease on all my connectors and plug wires made a big difference.
NOW on to the real point of this thread, i want to put my fully cnc'd gt40 heads on the car. i want to run my cobra intake but will it flow well enough in stock form?? I have read that porting the lower is a good idea but i wanted some feedback. I will be running my listed parts plus 1.7 rr

stykthyn · May 31, 2012

not as well as a ported lower, but I dont think you are going to be disappointed.

a91what · May 31, 2012

Will just a port match make any differance? I hear the runner walls are thin and i dont want to take any chances...

Noobz347 · May 31, 2012

a91what said:
Ok i tried swapping out the pcm and no luck getting codes but i have no more problems either.. it seems that when its raining or on a humid day i have the issue so i went thru and put dielectric grease on all my connectors and plug wires made a big difference.
NOW on to the real point of this thread, i want to put my fully cnc'd gt40 heads on the car. i want to run my cobra intake but will it flow well enough in stock form?? I have read that porting the lower is a good idea but i wanted some feedback. I will be running my listed parts plus 1.7 rr

What chip are you running? Are you running one that plugs into the back of the ECU?

If so, that could have been your problem all along. I run a 4 bank chip... have for several years. In that time, I've had to pull the chip, clean the contacts on the EEC and on the chip and reinstall because they're not making good contact.

Get yourself some Deoxit. http://store.caig.com/s.nl/sc.2/category.188/.f

stykthyn · May 31, 2012

Don't waste time on a port match. By the time you pay to port your intake you can purchase a used intake or you are well on your way to a better one.

a91what · May 31, 2012

Ok i will just put the thing together then TMOSS reported something like a 15 hp gain from just the lower, but swapping from stock heads to these gt40's will probably be a HUGE gain. heck just the new springs would make a diff.

I am running an SCT 4-bank eleminator chip. it plugs into the back of the ecu i really like it alot. the car runs way better with the tune on, I have all the emissions deleted and have the chip burned for all that so the ecu doesnt go nuts.. and from now in i use grease on everything. cant say it fixed the whole problem, (waiting for it to rain again.)

Noobz347 · May 31, 2012

a91what said:
Ok i will just put the thing together then TMOSS reported something like a 15 hp gain from just the lower, but swapping from stock heads to these gt40's will probably be a HUGE gain. heck just the new springs would make a diff.

I am running an SCT 4-bank eleminator chip. it plugs into the back of the ecu i really like it alot. the car runs way better with the tune on, I have all the emissions deleted and have the chip burned for all that so the ecu doesnt go nuts.. and from now in i use grease on everything. cant say it fixed the whole problem, (waiting for it to rain again.)

If that chip makes poor contact with connector on the back of the EEC then ALL KINDS of strangeness happens!

a91what · May 31, 2012

good to know ill pull it out and clean it again, should i grease that to or will that cause problems?

stykthyn · May 31, 2012

a91what said:
Ok i will just put the thing together then TMOSS reported something like a 15 hp gain from just the lower, but swapping from stock heads to these gt40's will probably be a HUGE gain.

yes you would undoubtedly see a larger gain. it all comes down to how long you want to extend your build and how much money you want to spend. You will spend 250-300 dollars to send the intake off the get ported. With that kind of cash you can buy one that is already ported or you could buy an intake that will flow more out of the box. Used intakes sell for cheap. 10 years ago it would have been prudent to port the lower. now that the market is littered with a TON of aftermarket parts you can score a decent used piece for change.

a91what · May 31, 2012

Ok i really want a bbk ssi intake, but for 600 bucks its out of reach.. most of what i have i got used or did myself. the heads my cuz did for me it was a project for his proformance engine school class. he put them one the machine then hand blended all of it. with stock valves they flow 210 cfm intake and 165 cfm exhaust.
I like the BBK intake what should i pay for a used one?

stykthyn · May 31, 2012

the BBK unit is generally regarded as a failure. It is pricy and has some serious flaws that can cause your car to burn down. do a search and you will see no small amount of information on this. Trickflow and edelbrock both top my list. They offer several intakes from mild street to full blown track applications. If you buy used be wary of anything that has been welded on(ask me how I know).

jsw81 · May 31, 2012

BBK is junk. I say Holley, trick flow, and edelbrock are your best bet. I wish I hadn't gotten my cobra intake...but at the time I wasn't planning on doing heads and cam...then of course a used set of TW 170's came up for sale at a killer price and I had to get them....already had the intake so just went with it. Has gobs of torque down low though; makes for a fun street car.

a91what · Jun 1, 2012

Thanks for the info. My setup makes tons of power down low which is what im looking for the car is heavy (convertible) but i still manage to eat the other fox's up around plant city. (most of them there is one white coupe im hoping to catch ) The new heads flow well and the car is a street car only see's some track use. i just like the way the bbk looks its a sharp intake.

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