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Author Topic:   Hesitation
Greenstang
Gearhead

Posts: 879
From: its all a fog..
Registered: May 2001

posted 10-03-2001 01:46 AM     Click Here to See the Profile for Greenstang   Click Here to Email Greenstang     Edit/Delete Message   Reply w/Quote
Howdy guys,
(Please Pardon the non racing Q)
I have been playing around with a friend's truck, trying to get it ready for a 4 wheel caravan, (not quite a race...)and I'm stuck...
symptom's:
Bad hesitation,
truck bascially stops running
tach drops ~500 RPM's
it does this at 50MPH (2500 RPM's in 3rd)
or at the top of first (~5K RPM's)

We swapped out the carb (had one NIB waiting anyway), and the fuel pump (stock replacement)
After the fuel pump, it ran okay for a day or two, then the surging cam back with a vengence. The only fuel filter I saw was the one right up at the carb, and it was changed...

Any ideas of what to try next? I was thinking cap; rotor; plugs; wires; coil...
motor is dead stock, 226K miles... wires were last changed a year ago..

My only thought is sediment in the tank...
TIA

------------------
Marcus
"We are coming after you. God may have mercy on you, but we won't," Sen. John McCain

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JAAZZY
Gearhead

Posts: 666
From: Bay Area, CA
Registered: Apr 2001

posted 10-03-2001 01:02 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
If it ran okay after the new pump for a while I would wonder if your have a clogged fuel filter or a worn cam eccentric(I think that's the part). Seems like a fuel supply problem since it was okay for a bit. My car does something very similar when the fuel injection doesn't get adequat voltage. If you have an electric fuel pump sitting around you might try it.

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[email protected]
Journeyman

Posts: 33
From: Lakewood, CO, USA
Registered: Jun 2001

posted 10-03-2001 02:18 PM     Click Here to See the Profile for JCQuinn@work   Click Here to Email JCQuinn@work     Edit/Delete Message   Reply w/Quote
I once had this exact problem. I changed all sorts of things and didn't find the problem until I dropped and drained the tank. When I was dumping out the remnants and sediment through the guage sending unit hole a large slimy blob plopped out. Upon closer examination it was the inside portion of an egg that someone had nicely placed in my tank. I actually figured out what it was from the shell fragments. That blob floats around in the gasoline and ocassionally gets sucked near the line which it blocks. It is too solid to go through the line so when the engine is shut off for awhile it just floats away from the outlet and the engine runs fine until the next egg block.

Its a great way to drive someone nuts. If you can't find any other problem you might check the gas tank.

John

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MrXerox
Gearhead

Posts: 226
From: Oklahoma, Oklahoma, USA
Registered: Nov 2000

posted 10-03-2001 11:11 PM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
Guess cars dont build more muscle by consuming eggs huh?

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Greenstang
Gearhead

Posts: 879
From: its all a fog..
Registered: May 2001

posted 10-04-2001 12:12 AM     Click Here to See the Profile for Greenstang   Click Here to Email Greenstang     Edit/Delete Message   Reply w/Quote
Thanks for the thoughts guys
Unfortunately, I just talked to him again tonight. It seems He never actually had it on the freeway warmed up after the pump change. He ran it on the freeway cold and it didn't do it, so he ASSumed it was okay. Warm it is as bad as ever, no change.
That leaves me thinking ignition, not so much fuel.
My plan for this weekend (since he had to cancel on the wheelin` caravan) is:
1.pull and plug the vac advance
2.crawl around looking for another fuel 3.filter
4.new coil, cap, and rotor
5.check for shorts and all the wiring.
6.Drink many cold beverages while swearing at said rig

Side note: it happened on the way way from Pismo down south, after playing around in the dunes and surf. Is it possible that running it hard in the dunes He wore out the valve springs (Potentially 226K miles) and is getting valve float?
I am leaning not, as it happens at differing RPM's and seems more dependant on speed...
TIA again
EDIT: Guess?!?
------------------
Marcus
"We are coming after you. God may have mercy on you, but we won't," Sen. John McCain

[This message has been edited by Greenstang (edited 10-04-2001).]

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Moneymaker
Administrator

Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 10-05-2001 04:09 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Not a valve spring problem. Look at the elementary stuff first. Check the timing too!

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Greenstang
Gearhead

Posts: 879
From: its all a fog..
Registered: May 2001

posted 10-08-2001 05:21 PM     Click Here to See the Profile for Greenstang   Click Here to Email Greenstang     Edit/Delete Message   Reply w/Quote
Thanks for the help guys
The answer?
new distributor...
Truck now hauls

------------------
Marcus
"We are coming after you. God may have mercy on you, but we won't," Sen. John McCain

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