Hunting idle, bad gas milage, hesitation

[speeding_infraction]

Would two crossed injectors (or more) cause these issues? When I replaced them with skankfoot injectors I didn't label the plugs and I'm wondering if thats why I'm having these problems.

 

Cruisers tips that might relate to the issue that I haven't done:

 

7, 9, 12, and 13

Please help, thanks in advance

[speeding_infraction]

It will hesitate up to about 3k and then all the power comes back. It revs great when in neutral 

[ghetdjc320]

6 minutes ago, TurboedMJ said:

Would two crossed injectors (or more) cause these issues? When I replaced them with skankfoot injectors I didn't label the plugs and I'm wondering if thats why I'm having these problems.

 

Cruisers tips that might relate to the issue that I haven't done:

 

7, 9, 12, and 13

Please help, thanks in advance

It shouldn’t make much of a difference. Sequential injection is a bit smoother at idle but untimed batch injection works just fine on many engines. Not likely to be the root cause IMO but would be good to get that fixed at some point.

[cruiser54]

[speeding_infraction]

Thanks, I will check that later. Do you think doing any of the tips I've mentioned above would help?

[cruiser54]

None of them can hurt....

[speeding_infraction]

5 and 6 were backwards. Might have helped, need more miles to confirm.

[speeding_infraction]

Noticed an empty plug on the firewall by the MAP sensor, IAT was unplugged. Not sure who worked on this previously but I'd like to speak to them😡

[speeding_infraction]

There's a couple other empty plugs as well. Anybody know what these go to? 

Right by the air box/ballast resistor

 

 

Located just in front of driver's side engine mount.

[cruiser54]

On the driver side you have CTS, knock sensor and O2 sensor. 

 

Looks like CTS isn't plugged in. 

[speeding_infraction]

Where is the harness side for the CTS supposed to come out?

[cruiser54]

Right behind the power steering pump with the knock and O2 harness. 

[speeding_infraction]

So the CTS in my thermostat housing isn't factory?

[Ωhm]

a.k.a. ECT - factory location

 

[speeding_infraction]

9 hours ago, TurboedMJ said:

 

Right by the air box/ballast resistor

Anyone know what this is for?

[87MJTIM]

2 minutes ago, TurboedMJ said:

Anyone know what this is for?

 Judging by the connector with the wires cut close (right side) and the blue crimp connector with the red wire, I will say a PO did some home-brewed wiring.

 

I don't recognize that gray connector from my 87. 

 

Can you find any open connector close by that yours may fit?

[fiatslug87]

There should be an EGR solenoid on the fender, that’s what the gray connector is for.

[speeding_infraction]

57 minutes ago, fiatslug87 said:

There should be an EGR solenoid on the fender, that’s what the gray connector is for.

Ok that would explain it, P.O. deleted the EGR. 

[speeding_infraction]

Well the hesitation is gone, not sure about the other two. Is there any way to test what the iac is doing when the truck is running? 

[cruiser54]

drive it for a while. 

[speeding_infraction]

7 hours ago, cruiser54 said:

drive it for a while. 

Don't have to tell me twice

[cruiser54]

And enjoy it!!!

[speeding_infraction]

Ok so little update on this, does anyone know what the fpr is supposed to look like and be rated at for the RENIX 4.0l engines? I believe I have the fpr for a 2000 4.0l, which should regulate the pressure to 49 psi. However, I have RENIX injectors from skankfoot. Would this lead to too much fuel being injected?

[Ωhm]

18 minutes ago, TurboedMJ said:

does anyone know what the fpr is supposed to look like and be rated at for the RENIX 4.0l engines?

 

On the end of the fuel rail.

@brucecooner

 

With ENGINE at IDLE, vacuum hose connect, look for ≈31psi, with hose disconnected, look for ≈39psi.

[speeding_infraction]

Can I retrofit an 89 fuel rail to a 2000 intake manifold? Or an '89 fuel pressure regulator to a 2000 fuel rail