362304

gonna keep this as short as i can

1/2 bridgeport motor with 0km

48ida carb with the following
220 mains f11 emulsion tubes
120 10 / 6.5 what i think is idle jet

and the problem is that...it only starts a good 10% of the time. the first time that oil was added into the combustion chamber, it started and ran for a good 5 minutes while maxvol was tuning the carb. he thinks that its lack of compression in the motor since it hasn't been broken in yet. we're wondering if it could be anything else thats causing the problem. hopefully maxvol will fill in any other details i'm missing later on tonight

thanks
david

Druken

I'll say it's either a vacuum leak that you might have overlooked, timing, or even the battery might not be charged enough to fully turn over the engine (since it takes a pretty big electrical load from the battery to start the car).

MazdaMike02

iTrader: (4)

Battery, Timing, Vacuum leaks. Check those, you should find the problem.

Siraniko

iTrader: (13)

there we go again with all the here ya go from another thread coz your guesstimate is not close enough. start reading the facts instead of jumping into conclusion

First, incorrectly installed dizzy can cause hard starting. It means it was not in "TDC" when installed. Secondly, a IDA's clogged idle circuit is another factor. What you said about the compression is something Im not buying.

362304

thanks for the replies guys, i'll answer to best i can

BATTERY is ruled out because i have one of those shop charger things that has a start mode hooked up to the thing.

CLOGGED IDLE CIRCUIT this i assume is ruled out because we tried another ida48 that came from a running motor and it started the first time, and i don't think ever again...lol

VACUUM LEAKS don't know about this one as we didn't look into it much, only thing vacuum i remember is that vacuum advance is not hooked up

DIZZY NOT AT TDC WHEN INSTALLED not sure about this one because once it actually catches, it runs pretty strong, so i wouldn't be able to differentiate if the dizzy wasn't installed properly...



thanks
david

Siraniko

iTrader: (13)

once it catches??? like how long?? it suppose to do it as soon as you start it.

362304

errr either i'm too tired to think, or studying for exam is making everything blow right by me, please elaborate on the "like how long? it suppose to do it as soon as you start it" sorry for being dumbfounded atm

thanks
david

djessence

like how long do you sit there starting it and having it turn before it actually starts or "catches" as you put it. Because it should "catch" in less than say....5 seconds.

362304

it catches within 5 secs, thats if it does catch


thanks
david

Siraniko

iTrader: (13)

wow, you dont seem confident with your answer
if I were you, I will re-drop the dizzy. this time, look for an old thread on how to find TDC; this is to ensure that you're not 180* off.

362304

i'm trying to say that, if it does catch, it will within the first 5 seconds, but most of the time it doesn't catch. thx for the tip, i'll go try it out when i can/after exams(thursday)

and thanks to all those who replied

david

maxvol

iTrader: (2)

"I will re-drop the dizzy. this time, look for an old thread on how to find TDC; this is to ensure that you're not 180* off." Thanks wackyracer

I will be sure to check that as soon as I get back to the car.


When the engine starts its very strong, it runs for a few minutes I got it to idle.. then it just died..

has gas, has spark.. will check the dizzy

Siraniko

iTrader: (13)

Well, its really hard to diagnose something with incomplete info OR when you guys have no clue on what to look for. Unfortunately, I have to say that you guys suck big time. Reminds me of Skipper and his little buddy Gilligan.

So which one is it????

Hard starting
Wont hold idle

**** it, tell me everything that you have from fuel pump to fpr to ignition.

maxvol

iTrader: (2)

The car is very hard to start, up to 30 seconds of cranking and not every try. Once it does start it runs good, and I can tune the carb so that it holds idle around 1,000Rpm, but as soon as I give it gas the car revs then once it comes back to normal operation it will slowly die unless I press the gas then it will go back to Idle.

Once the car dies, or shut off its almost impossible to get it started again, (Warm or cold)

For FPR its a Holley.

Ignition is stock and the dizzy is at dead center

fuel pump I am not sure, I will get "362304" to post that

any help will be appreciated.


-Max

Siraniko

iTrader: (13)

Does it start immediately if you use starting fluid or when you pour some gas in the carb?

maxvol

iTrader: (2)

No. To get it started the last time I unpluged the fuel pump cranked it untill there was no more gas in the carb then pressed the accelerator linkage 4 or so times..(plugged pump back)

and the car Barely barely started. I have not had a lot of time working with this car, i just met the owner and decided to help out.

I will go to his car sometime this week and I will provide a video and all the detail I can find so that I can remedy the problem

again thanks for your time Wackyracer.

DriveFast7

iTrader: (1)

A larger fuel jet will help that. I had the same prob. Try a 70 idle fuel jet it helps on trailiing throttle since the progression circuit is sucking fuel at that point richening the idle fuel mixture won't help.

maxvol

iTrader: (2)

Well I think that I know what the problem is, I figured this out when trying to get it to start this Friday...

When I crank the car fuel spews out of the top.. This is caused by the fuel pump that is installed on the car, The pump is an FI pump and the regulator that is on the car does not work.. so I am getting a huge surge of fuel that keeps on overflowing the bowls, when the car stands for a few days and the gas evaporates it starts.. ONCE!!

as soon as its shut off, it will never start again..

So this weekend I will change the regulator first, and see if I can get it to 4 PSI or so, if not my CARTER fuel pump will go instead of the FI pump..

Once the car starts it backfires like mad, even if I try to lean it out it still runs RICH as hell

Again thank you for all the input that you guys had on the subject..

I will update with the results of my tinkering as the car will be at my shop from tomm.. so I will have lots of time to Screw around..

-Max