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Index > Engine/Drivetrain > Thread: Starting problem
Thread: Starting problem
Jibble22


Newbie
Posts: 7
posted July 23, 2008 11:26 PM

Starting problem

I have a street ported 13B with WEBER side-draft carb, electric (holley red) fuel pump, new cap & rotor, new plugs, newer MSD blaster coils, new wires, and 5 lbs of fuel pressure registering on my fuel pressure gauge. The timing is correct and the coils have strong spark, but it's very hard to start

IDEAS???
____________
Drive fast and swerve alot

       
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Klaus45


Redlining
On two wheels
Posts: 218
posted July 23, 2008 11:57 PM
Edited By: Klaus45 on 23 Jul 2008 23:59

I don' t know those carb's intimately, but...:

...how's the choke working?

Hard starting cold... or hot? Low compression?

2nd guess: What are the odds you're developing a vacuum leak? Lots of usual suspects there... Every single possibility is suspect.

3rd guess: Float height/fuel level/pressure not entirely dialed -- despite whatever anyone else says/is supposed to be 'correct'. Worth double checking...

Possibly pertinent thread: http://www.mazdarepu.com/board/viewthread.php3?FID=2&TID=2198

Best of luck, and welcome to the forum!

       
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Jibble22


Newbie
Posts: 7
posted July 24, 2008 12:28 AM

Starting problem

Klaus, thanks for your input. The carb does not have a choke and never has. The truck was starting great until about a month or so ago. So I changed the plugs, cap and rotor. But no such luck.

My engine is stripped down and has no heater, nada. Just a mechanical water pump and alternator to drive so I have NO vacuum lines except to the master cylinder. But I'll trouble shoot for vacuum leaks with starter fluid and see if it makes a difference.

I am thinking my next line of attack is to rebuild the carb... ugh. I just HATE fine tuning this BIG (50 mm) dual side draft WEBER carb.

Know of any good rotary techs in the Seattle area?
____________
Drive fast and swerve alot

       
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Klaus45


Redlining
On two wheels
Posts: 218
posted July 24, 2008 09:54 AM

I've not yet ever visited 'em...

...but I'd guess that www.atkinsrotary.com would be a good place to inquire.

       
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tom93r1


Redlining
Posts: 458
posted July 24, 2008 01:47 PM

My weber DCO started acting up and drips fuel into the throat after I shut it down. Makes it really difficult to re-start. I think that may now be resolved since I re-adjusted the floats. They may have been causing the bowl to fill too full then drip in. The excess fuel floods the motor and makes it lose compression so it doesnt want to start again.

Take off your intake filter then turn the key on just to get the pump going. Is there fuel dripping inside the carb?
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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sparky


Redlining
Posts: 299
posted July 24, 2008 04:11 PM

Might be electrical related. I have had 2 REPU's and both had issue with ignition switch. Try connecting volt meter on coil + and monitor voltage while starting. My igntion switch would cut off power to enging electrical when in the start position. I installed momentary toggle to engage starter. Truck starts awesome. Good luck.

       
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Klaus45


Redlining
On two wheels
Posts: 218
posted July 24, 2008 07:33 PM

Good point, Sparky!

I had that happen with an ignition switch in the past, myself...

       
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