 Chevytech
Subject Matter Expert - Senior Member
Posts: 2693
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
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02-28-12 08:42 PM - Post#2196505
In response to S10Fanatic
You’re welcome.
I don’t have a 1992 manual handy so I looked it up in a 1993 manual for a 2.8 Liter with a manual transmission.
The desired idle speed is 800 RPM plus or minus 100 RPM, at sea level, fully warmed up, in closed loop, with all accessories off.
Anything out of the normal range, like a low charging voltage may cause the system to raise the idle speed.
It is within the acceptable range.
As for the surge:
You could disconnect and plug the EGR hose, and take it for a test drive.
Testing the fuel pressure would be a good idea too. Just because you replaced the pump does not mean the pressure is good. There are multiple failures that can causes the TBI trucks to have low fuel pressure other then the fuel pump. It could have a fuel pressure regulator problem.
As these trucks get older it is becoming a common problem for the rubber hose in the tank between the fuel pump and the sending unit to split. Some people notice when this starts happening the truck will run better with more fuel in the tank.
I would only use original equipment parts on the EGR valve and the fuel pump. If an aftermarket fuel pump was used I would be suspicious of it. I have seen so many fuel pumps from other manufactures fail in the warranty period or just after the warranty is up that I suggest only using an OEM pump.
The TBI fuel pressure specification for small block Chevy’s is 9 – 13 PSI with the truck running.
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If the it has been altered from stock let us know about that too. |
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drtyler (4)
