I have an auto. 90 Camaro RS, recently swapped the TPI 305 for a carb. 355(bored 30 over)(didn't have the $ for fuel injection). Lately I'll be driving along and out of nowhere my car will stall so I hit the gas a little more(nothing happens), seems to have no effect how much or little I hit the gas, sometimes it'll pull out of the stall and run like normal again and then other times it'll just die. When it does die sometimes it will start back up with no hesitation and other times it won't even try to turnover, so I wait 10-15 min and it starts right back up. What's the problem, and how do I fix it? Don't have $ to go to a mechanic. What I do know is my pcv valve is not hooked up, and the vacuum line that runs from the intake manifold to the back of the carb is not hooked up. My engine is loosing about 1 qt. of oil a week, but I think my heads just need to be retightend cause its such a new engine & looks like it may be leaking from the sides. Any answers are greatly appreciated.
2007-09-04 10:11:08 · 8 answers · asked by nick 1 in Cars & Transportation ➔ Maintenance & Repairs
Lets get this sorted out. What type carb do you have? Sounds like a float adjustment prob to me.
Next being a 90 camaro EFI, you had a high pressure fuel pump in the fuel tank.. What did you do about that? IIRC that pump puts out around 35 psi.. Way too much for a carb.
Carbs only can handle 5 to 6 psi on most and a few can handle up to 8 psi.
Did you use a mallory high pressure adjustable reg on the supply line and adjust pressure done and kept the elec. pump in use.
Or did you pull the elec pull, and put a mech. pump on the block?
If so then that may be your prob.. Some people gets away with it, I never have been able too myself.. It's hard for a mech. pump to pull fuel through the stock elec. in tank pump..
I always pulled the sender/pickup out of tank, and took pump off and replaced it with a lenght of metal fuel line.
Next what about your fuel filter.. It could be dirty, or clogged up..
If your using a Q jet carb, the carb also has a small little filter in the fuel inlet.
Put a PCV valve in 1 valve cover and hook hose from it to a big port on carb.
Put a breather in the other valve cover.
Run a vac hose from power brake booter to the other big port on carb, or to fitting in rear of intake behind carb.
Run your small vac line of dist. vac advance to a timed/ported vac nipple on carb.
If th-350 or th-400 trans with vac mod valve, run line from it to full time vac port on carb.
Next, theres no oil between the block deck and heads.. So no oil is not leaking from between them.
If oil is on the sides of heads, block, then what I have always found was a valve cover gasket thats leaking, or the rear (sometimes front too) intake end seals leaking. That will leak oil, plus cause a vac leak.
If you need any more help or have any questions about your set up, feel free to Email me. I'll be glad to help you as much as I can.
2007-09-04 13:28:26 · answer #1 · answered by chevyraceman_383 7 · 0⤊ 0⤋
You might want to check that carb out. I don't know it, what kind of choke or anything. That symptom can happen if the choke opens too far on some of them. Is your choke based on engine heat? I would have someone hold it in different positions after the problem occurs, and see if it affects it at all. If it's a new carb, it should be fine, but just be sure. Make sure venturis or anything like that are tight and nothing is affecting the vacuum which is sucking down the fuel...which brings me to that pcv valve....
Why isn't it hooked up? If you mean not hooked up and just flappin' in the breeze, that vacuum leak would definitely be a suspect. The vacuum hose that goes to the back of the carb...again, why isn't it hooked up? If it isn't needed for your new carb, then it should be pinched off. If you calibrate the carb with a vacuum leak, you'll have to do it all over again as it is.
2007-09-04 10:23:05 · answer #2 · answered by messenger_of_the_void 2 · 0⤊ 0⤋
After it stalls, will it start up after a short time of sitting?
I had a '73 Buick that did that. It turned out to be a faulty fuseable link in the electrical system.
Maybe a reputable auto parts store (like NAPA) might be able to advise you, but back in 1973, it was a dealer repair.
2007-09-04 10:22:08 · answer #3 · answered by Bobby Jim 7 · 0⤊ 0⤋
Well since its older thats more common but just listne to it idle and if its lowering give it a few nice revs. Just rev it constantly while driving but check the spark plugs to see if the igniter it properly hooked in. Also check the fuel pump first.
2007-09-04 10:21:31 · answer #4 · answered by Veleno 3 · 0⤊ 0⤋
I had the same problem a few years ago with my Blazer and it turned out to be the ignition module located under the distributor cap.
2007-09-05 19:44:23 · answer #5 · answered by cutlasssteve70 1 · 0⤊ 0⤋
Check your fluid Levels first and for most Just because. Second I would check your fuel filer or maybe your fuel pump.
2016-04-03 03:35:56 · answer #6 · answered by Anonymous · 0⤊ 0⤋
When my car did that it turned out the fuel pump was going bad.
2007-09-04 10:15:24 · answer #7 · answered by Carolyn D 5 · 1⤊ 0⤋
Sounds like the fuel might be losing it's prime.
2007-09-04 10:16:28 · answer #8 · answered by towbusiness 3 · 0⤊ 0⤋