Excessive Cranking

I have an 92 Chevy K1500 and am experiencing some difficulties in starting the motor.

The engine is a rebuilt 350 with an edelbrock multi-port fuel injection manifold kit installed. Almost every major component is new. with the exception on the sensors which were retained.

Now for the symptoms. . . . I will turn on the ignition and it takes a long time for the engine to crank up and start. Once started it idles very smooth. When driving, I notice that if I really stomp down on the accelerator at a dead stop, then smoke will come out the tailpipe. the new engine was properly conditioned before general use. Every now and then at low speeds (around 5 and 10 mph) the engine acts as if it is hesitating, very jerky.

Can anybody recommend anything? I have replaced the starter motor, egr, fuel pump relay, coolant temp sensor, throttle position sensor,

The truck is a monster on the highway, i average 1900 rpm at 70mph, and the acceleration is intense. I love my truck.

jaime

It sounds like it is running rich. When the truck starts do you get a puff of black smoke out the pipe? You might need to call Edelbrock and tell them about anything that was changed from stock, like cam, or head modifications if any, and the problem you are having. They might have to send you and updated EPROM for your setup. Hope this helps.

[QUOTE=AMOR4PAZ]I have an 92 Chevy K1500 and am experiencing some difficulties in starting the motor.

The engine is a rebuilt 350 with an edelbrock multi-port fuel injection manifold kit installed. Almost every major component is new. with the exception on the sensors which were retained.

Now for the symptoms. . . . I will turn on the ignition and it takes a long time for the engine to crank up and start. Once started it idles very smooth. When driving, I notice that if I really stomp down on the accelerator at a dead stop, then smoke will come out the tailpipe. the new engine was properly conditioned before general use. Every now and then at low speeds (around 5 and 10 mph) the engine acts as if it is hesitating, very jerky.



Thanks for replying . . . I do get a puff of black smoke when it's started up, and I do smell a gasoline smell on occasion

I will give them a call, thanks again

jaime

When you find your problem, would you post it on here. I am thinking of upgrading to the Edelbrock multiport setup, or the GM TBI to Vortec intake, and heads.

Sorry it took so long to reply, I got onto the website for edelbrock and it said the fuel pressure should be 42 to 45 psi and should not drop no more than 10 psi in five minutes. I did an key on,engine off fuel pressure test and got 35 psi, (could be the fuel pressure regulator) also did engine on and got only 40 psi. When I turned off the engine, the pressure bled off instantly down to 15 psi. I am thinking leaking fuel injector(s), flooding the cylinder causing overrich condition upon the second start and excessive cranking. Which I believe will ultimately lead to catalytic converter failure. Tomorrow I will pull the spark plugs to find the leaky injectors and check o-rings. Do these need to be any special o-rings?

Ok I have finally figured this part out.

I was having low fuel pressure, I pulled the bed off the frame and pulled out the fuel sending unit. there was a small section of hose connecting the Edelbrock fuel pump, this hose was not fuel injection (which what was called for,also the clamps were cheap plastic) I replaced witht FI hose and FI clamps and now the fuel pressure is 45 psi exactly, and maintaining at that pressure.


However, I now have a new problem. It seems that when I start my truck up in the morning, it starts right up. If I drive it someplace and turn off the engine when I go to restart it up, it still takes excessive cranking to fire up the engine.
It has been recommended to me that the ignition module is suffering from heat soak, and to check to see if there is a layer of grease film, underneath it and where it sits on the distributor. I will check that this weekend. Is this a possible cause of hot start difficulty? I also read in the past posts about a oil pressure sender that if faulty cuts out the ignition signal to prevent startup with no oil. How would I check this?

Thanks to all for your help on fuel pressure issue.

jaime
1992 k1500 w/Edelbrock MPFI Conversion kit

In order to test the Oil presssure sending unit you would start the truck and disconnect the relay on the passangers side of the firewall (says "fuel pump relay"), If the truck dies the senidng unit is bad, if it stays on it is good.