lq4 dies when given throttle
#1
lq4 dies when given throttle
I have a 70 chevelle with a LQ4 with ported ls3 heads a cam and ls3 intake. If you give it throttle at all it will start to die unless you tap it and then it will start to go. Any ideas on what could be happening would be greatly appreciated. I just got this thing finished so I guess it could be anything. I got a basic tune for what I had from Race Proven Motorsports but I doubt its the tune since it was fine when i first fired it up. A couple of weeks ago.
#6
Check vacuum line to fuel pump regulator, could be leaking or missing. The FPR must get vacuum from the intake manifold. When you open the throttle you let a lot of air in, but it also needs fuel to go with it and if the fuel comes with a "delayed reaction" it can die.
#7
TECH Fanatic
iTrader: (7)
I had same issue only to find I had a fuel leak in a line I had not tightened. Double check your pressure at the rail via the Schrader valve.. I have a gauge on mine for permanent duty, and I only needed 2 fittings and a gauge. The fittings cost me about $13 and the gauge was $30 from summit.
I have 48PSI at idle and when I gas it, it jumps to 56-58 psi.
If you only have a basic tune to just get you going, then you definitely need the tune worked on. Best of luck.
I have 48PSI at idle and when I gas it, it jumps to 56-58 psi.
If you only have a basic tune to just get you going, then you definitely need the tune worked on. Best of luck.