I have had some hugging and chugging issues in the last month. It started with what I think was heat soak. It was 90+ degrees out and in the morning it was about 80. After work it was about 100 on the temp gage in the Jeep.
All parts listed are from discount auto parts stores. I know, I know.
I checked the fuel pressure and it was erratic (30-50) and would drop immediately after shutoff to about 25. So I replaced the fuel pump.
This seemed to take care of a significant portion of the problem.
ON startup (after sitting for a couple of hours), it starts fine. After about 1 mile, it hugs and chugs and revs, drops RPM, pops and cracks, then it works itself out, and it runs fine all the way to work.
In the last month I have replaced: Fuel pump, distributer, plugs, wires, coil, IAC, TPS, brakes, **fuel injectors**. I have checked the wiring harness around the injectors and the sensors including the O2 sensors. Everything looks OK.
I replaced the fuel injectors with some Chinese ones that I found online. They said "direct replacement". They had 4 holes and seem to flow about 4X the fuel. I am not sucking enough air through to burn THAT much gas. I swapped the stock ones back in.
Last night I decided to do a leakdown test overnight. It visually dropped to 40PSI quickly. Then after about 2 hours it was at 20. Then a bit later it was 15 then this morning, it was at 5 or a bit less. Should the fuel system leak all the way down overnight?
All parts listed are from discount auto parts stores. I know, I know.
I checked the fuel pressure and it was erratic (30-50) and would drop immediately after shutoff to about 25. So I replaced the fuel pump.
This seemed to take care of a significant portion of the problem.
ON startup (after sitting for a couple of hours), it starts fine. After about 1 mile, it hugs and chugs and revs, drops RPM, pops and cracks, then it works itself out, and it runs fine all the way to work.
In the last month I have replaced: Fuel pump, distributer, plugs, wires, coil, IAC, TPS, brakes, **fuel injectors**. I have checked the wiring harness around the injectors and the sensors including the O2 sensors. Everything looks OK.
I replaced the fuel injectors with some Chinese ones that I found online. They said "direct replacement". They had 4 holes and seem to flow about 4X the fuel. I am not sucking enough air through to burn THAT much gas. I swapped the stock ones back in.
Last night I decided to do a leakdown test overnight. It visually dropped to 40PSI quickly. Then after about 2 hours it was at 20. Then a bit later it was 15 then this morning, it was at 5 or a bit less. Should the fuel system leak all the way down overnight?