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I have an E303 cam in a GT-40 crate motor from summit. I have a trick flow intake and the car has been tuned by Lidio from Alternative Auto. This is kind of a continuation from another post I had on hear, but now that I have done some troubleshooting I have in narrowed down to a vacuum/cam issue. (I hope) The car idles fine right around 1000rpms and has a great lumpy sound to it. The problem is with the bucking I get at low speeds whenI have the pedal just barely pressed. Give it gas and bring up the rpms and it goes away, push in the clutch or let off the gas and it goes away. Has anyone else had this issue or know how to fix it?
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Ok, soI disconnected the EGR both the connecter and the tube, I didn't plug the tube that I pulled off of the top of the EGR though. I would have to say there was almost no change, maybe just slightly less bucking at low speeds, very little difference though. I will try to find something to plug the small tube and try it again but I am thinking there might be no change.
The next thing I wanted to do was check the timing, even thoughI have been told it is set rightI still want to find out for myself, plus I want to learn how to do it. What should I be looking at timing wise for this set up?
GT-40 Crate Motor
70mm throttle body
#24 lbs injectors
Headers/H-pipe/2 chamber flowmasters.
Mass air sensor 75mm
Hey Cambellsoup....yeah my car does the samething I was pullin out my hair trying to chase down a vac. leak or some faulty sensor etc....its just the way the car drives....if you back down timing to stock it will make a reeeal minimal difference in driveability, but you will be sacraficing some HP...so dont do it...especially if a tuner has set it....that means its right where it "should" be.....
82 Mercury Capri EFI 5.0 bone stock.
87 White Notch all Orig.
93 Prerunner Ranger 302 swap, C4, eddy heads/Intake, F cam, . Tube chassis. 4-linked. 250hp/270rwtq
It is not the E-303. I've set E-303, Stg 1, B and X-303 setups (including my junk) that do not have that problem. Suggest to start by actually checking vacuum output from the engine at idle. At 750 rpms in a 302 setup, the engine should output 12"-13" Hg...... anything lower than that = you have a problem in the valve train setup/calibration, spark timing, etc. LUK
LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That, YCYDYP=Your Car Your Dough Your Prerogative and the classic... DILLIGAS=Do I Look Like I Give A S***
1986 GT-X303-289 heads-1.72 rockers-RG 4+1 Trans.
Originally Posted by Joel5.0
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