![]() |
|
![]() |
#1 |
Registered User
Join Date: Nov 2005
Location: Birdseye, IN
Posts: 99
|
402 Tune-up
A few months ago my Longhorn ran good but didn't have the power I would like. Lately it's running very rough, shaking and gurgling that gets worse when I give it gas. I don't have the time to tune it up myself so I'll take it to a local shop. Any suggestions on what all should be done for a good tune up?
I'll get new plugs and wires but not sure what else. Also when I take the gas cap off it releases a lot of pressure blowing out. I've replaced the cap once already but it hasn't changed anything. Any ideas? |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Jul 2003
Location: Cypress, Tx
Posts: 4,005
|
Re: 402 Tune-up
Check your fuel filter. Also make sure your running the correct gas cap. What year is the truck. You may need a vented gas cap. It sounds like your fuel filter is clogged and is building up pressure in the tank, as well as not feeding the carb. I had what sounds like the same problem on another truck. It was definitely the fuel filter. Change both the inline one (if you don't have one get one) and the filter in the inlet of the carb. JMO. Hope it helps.
SHawn Shawn
__________________
1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Nov 2005
Location: Birdseye, IN
Posts: 99
|
Re: 402 Tune-up
It's a 72. I'm not sure how it all works but why would the pressure be pushing air out of the tank and not sucking it in?
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Nov 2006
Location: Portland
Posts: 382
|
Re: 402 Tune-up
Here is the list of things I do for a tune up.
plugs wires cap rotor condenser if still running points, adjust them or replace check belts, replace if needed fuel filter(s) check air cleaner, replace if needed oil change (if with in the limits) check diff, trans, brakes, coolant You may have a weak spark. You may want to check the coil as well. My truck was doing the same thing, plus a starter issue. |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Nov 2005
Location: Birdseye, IN
Posts: 99
|
Re: 402 Tune-up
Thanks for the list. Having a shop do this I'm worried about the cost. Any idea of a ballpark of what it should cost?
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Nov 2006
Location: Portland
Posts: 382
|
Re: 402 Tune-up
I would guess between 250-350 if done by a mechanic.
It all depends on what they replace or not. You can always say, please do this, this, and this, but can you check this, this, and this as well and let me know? It isn't one of those things that needs to be done all at once. One of the times I did a tune up, it took me 3 weekends to do. I first did the plugs, wires, cap,condenser, rotor, and adjusted my points. The next weekend I did the fuel and air filters and replaced the belts. The following weekend I took it in to my BIL's Jiffy Lube and had the fluids checked. Total cost was around $150. |
![]() |
![]() |
![]() |
#7 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
|
Re: 402 Tune-up
If you don't know the history of the truck you may want to go a bit more in depth.The above suggestions are great if you have a solid foundation.If the engine is worn they will not help as much as if it's in good shape.
That said,the place I would start(again not knowing the condition of the engine) is with a compression test.It will tell you if the engine has good compression and if the cylinders are making even power. If you know the engine is in good shape you may want to skip this depending on cost.
__________________
The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
![]() |
![]() |
![]() |
Bookmarks |
|
|