sounds like popping through the intake

[ncontt]

Got the fairmont running.....ANYWAY.

background info:

timing set to ~10* with spout out
FP set to ~39PSI with vac. disconnected
TFS heads with 3924's gapped to .050
EGR disconnected (off road bassani x pipe)

OK...now the problem, it smells rich as hell but I was under the impression that popping through the intake was lean? :shrug: also, IAC may be suspect as idle "searches" a little (not bad) (I have removed and sprayed liberally with carb/choke cleaner to no avail).

Secondary problem, when under load (getting onto the gas) it pops/skips BAD. Plugs are fresh, coil is NEW, wires are almost new....this is really getting to my last nerve, any help would be appreciated.

Thanks.
Brad

[ncontt]

I "HAD" a C&L 73mm MAF supposedly calibrated for the 30 #inj's but it didn't have any colors on the flowtube when I took it off the meter itself. So I swapped those injectors out for the stock 19#'s and stock meter and it still does the popping under load.....also O2's look good and are also newish, I'm about to go check the trouble codes as the check engine light is on.

[qkjuicedpony]

check voltage to both power wires on your Throttle Position Sensor and report back

[ncontt]

with KOEO black to neg. lead of tester and positive to GRN wire voltage was .829, with neg lead of tester to black and positive to ORANGE wire voltage was 5.00-5.01

[qkjuicedpony]

Is your TPS adjustable?


If so bring it up to .98-.99

[ncontt]

no clue (even after google-age) how to read trouble codes (too few brain cells hitting on ALL cylinders )

at any rate, hooked up the test light as described (into pin #4 of test connector and to positive battery terminal, and jumper wire from pin #2 to the other "little plug".....light comes on with KOnEngOff

5 1 8 1 8 2 8 5 8 3 5 1 8 1 8 2 8 5 8 3 then long pause 1 5 1 9 6 5 1 9 6

:shrug: I think the 81 82 85 83 is all egr stuff isn't it?

[ncontt]

Is your TPS adjustable?


If so bring it up to .98-.99

it is...
I'll bring it up

[ncontt]

it is...
I'll bring it up

now set to .989-.990

[qkjuicedpony]

Any change to the way it runs?

What firing order are you using?

[qkjuicedpony]

Also are you sure your valves are adjusted correctly?

[ncontt]

HO firing order..stock stang order whatever that is...13726548. I didn't take it back out since it's getting late and I'm the only one home (besides my 13y/o) and if I got stranded..lol I'd be SOL. It seems to rev better now (where as before it would almost stumble off idle)

Also I can't seem to get it to get more than 10* timing on there (the TFI is almost hitting the upper rad hose on the therm. housing) WTF? This is also a LOW compression motor (turbo friendly -20 or so CC probe pistons)

[qkjuicedpony]

Sounds like when you timed the engine you may have set the distributor a tooth or two off.

Bring it back up to TDC and reset the dist so you can get a few more degrees out of it.

I ran an 8:1 motor N/A for a good while once and that thing loved a lot of timing

[ncontt]

Sounds like when you timed the engine you may have set the distributor a tooth or two off.

Bring it back up to TDC and reset the dist so you can get a few more degrees out of it.

I ran an 8:1 motor N/A for a good while once and that thing loved a lot of timing


I was thinking the same thing...I was thinking this would go 14-15 anyway....but who knows...I'll give it a shot tomorrow.

Preciate it.

Brad

[EHardy1971]

I'm with Qkjuiced.Get it @ #1 TDC,and when you re-stick it,the rotor should be pointing at 12 o'clock(ish),as you're standing in front of the car.

[coupe]

almost sounds like the cam is off...the popping and all. :shrug:

[ncontt]

almost sounds like the cam is off...the popping and all. :shrug:

I'm as sure as sure could be that the cam is correct (motor was built by ex PRO5.0 racer) and it did not have this problem when I had the incon twin turbo kit on this car, albeit with different injectors and meter (60#'s, and Pro-M meter for the Incon Kit)

Car also has edelbrock gear drive and billet timing pointer that I'm sure has NOT moved. I will see what I can find out today, I may also try some new plug wires, that's a relatively cheap idea, and it couldn't hurt to have them on there.

There are ALOT of possible variables with this thing as ALL the harnesses have been donated from a 90 Mustang and put into this Fairmont. I'm ASSuming that everything is hooked up properly and there are no loose connections.

On a side note I wish I still had my TwEECer so I could at least datalog, that might provide some insight into what was going on.....

Thanks for the suggestions guys.

[ncontt]

hope to get to it in the next day or so....

[Dale McPeters]

Hope they did not put a speed density cam in it.....:jester:

By the way I have never had any luck just cleaning the idle air control motors. I have always had to buy a new one....:(

[coupe]

I think the speed-density cams are the "hot" 3/4 versions Dale. They require high-test. :D

[ncontt]

lmao, it's a TFS stage 2 cam, Dale, I was thinking the same thing. I cleaned it...but I'm trying to keep from spending $50 or however much it is for a new one....

[Italian LX]

Go ahead and pull the valve covers and make sure none of the springs are broken.

[QWKSNKE]

My money is on the C&L meter. :yup:

[ncontt]

Go ahead and pull the valve covers and make sure none of the springs are broken.

probably wouldn't hurt to take a look would it....although at idle or a tad bit more there is no problem, it's just under load/and anything other than light acceleration

[ncontt]

My money is on the C&L meter. :yup:

:amen: although it did it with the stock meter/injectors as well.... :shrug:

[Wall96cobra]

It may have already been mentioned but double and triple check the plug wires, could be a couple swapped.

[LeeH]

Running rich will cause an engine surge at idle, but your pop sounds like either a lean misfire or a lifter pumping up. Did you restab your dist? The reluctor wheel syncs your injectors and if your #1 plug wire is not in the correct location it will cause injector sequence issues, For example if your a tooth off and have to move the wires on the cap to get enough dist. movement to time the engine.

[Italian LX]

probably wouldn't hurt to take a look would it....although at idle or a tad bit more there is no problem, it's just under load/and anything other than light acceleration
I had a valve spring break on me a couple years ago.

http://www.streetstangs.net/showthread.php?t=6717

For the most part, it seemed to run fine at idle and cruising speeds, but it would miss and pop through the intake under the slightest load.

[ncontt]

been helping a friend/neighbor move the last 2 days and have about 3 more hours worth of work....(time to catch up on all my yards) THEN I can maybe take a look at this....thanks for the suggestions guys. I will check wires again, but have done that several times (not to say a little gremlin didn't swap them) :)

I'll report back with results one way or the other

Brad

[ncontt]

got it running ALOT better today...think the combination of a speed density map/bap and a blockage in the fuel line had something to do with it (mostly map/bap) I blew out the fuel lines with some air and along with a new filter and some 93 octane gas it runs ALOT better...will have updated pics/video this evening when my son gets home from his fieldtrip (got the camera)....

[ncontt]

pics, marginal video are in the project section