ACIS and a vaccumm leak?

[Chris R]

I checked the codes, 21, 22, and 43.

22 is the water temp sensor, and I'm thinking that the water temp sensor is just stored from the other day when I had it unplugged.

So it's still throwing a 21, even though we've replaced the O2 sensor. I'll get out there and check the wire going to the ECU, and make sure the wire from the O2 sensor hasn't burned up because of the headers.


btw - I ordered the relay, but it won't be arriving until one day after I leave for college. Gotta love the four day shipping times for their two day shipping. Luckily I'll only be about 90 miles away, so I can still get my hands on the relay sometime later in the week. Will driving with the B+ and FP wires jumped at the relay connection be an issue for a week? I'd rather not burn my pump up.

 

[Chris R]

You guys probably so this coming. Rockautoparts.com didn't send me the correct relay, so I had to keep on driving with it jumpered at the relay connection, completely bypassing the relay altogether. I drove it like this for about a week.

I was driving earlier today and the car just revved down, and then died. When I try to start it, it's like the starter almost gets it going, but it just won't start. Hard to explain, but it seems to me like the car is not getting fuel.

My best guess is that the fuel pump was not designed to run on 12v constantly, so with no relay the fuel pump blew, or the fuse. When I jump Fp and B+ using the wires that came into that switch the PO set up, I can hear a whir in the back, which has to be the fuel pump. Jumping those two wires had the same effect of jumping the FP and B+ connections at the diag box, where the relay would sound. Jumping those two connections at the relay connectors did not make the relay sound, obviously.

But with all the relay connectors hooked back up like normal, I hear a whir coming from the rear of the car. I don't hear any sound coming out of the relay up in the engine bay, despite it being connected.

I haven't checked the fuse, when I called toyota they told me it was either in the drivers side kick panel or the engine bay fuse box, but I had checked those before and didn't see anything relating to a fuel pump fuse. All the fuses I checked in the engine bay box looked fine.

Despite the whir in the back when FP and B+ are jumpered at the PO's switch it the dash, I'm still guessing either the pump is gone, or the fuse blew. I'm going to recharge the battery tomorrow for the hell of it and see if it starts. Pumping the gas doesn't do anything, but it does seem to help when you jump the FP and B+ connections at the PO's switch.

 

[jetjock]

Your best guesses pretty much suck

Pumping the pedal when cranking does absolutely nothing in a fuel injected car. Holding it to the floor is another story but we won't get into that.

Fuel pump gets it's power through the EFI fuse both during normal operation and when using FP to run it. If the EFI fuse was blown you'd have a lot more issues. Nor would you hear the pump.

What happened to you getting a fuel pressure gage? Be handy right about now. There are several ways to check the pump. 1) Look at the screw on top of the pulsation damper. 2) Crack the CSI line. 3) Set your meter to current and use it in place of the jumper.

Too bad you don't have a scope. With it could tell everything about the pump's health including what rpm it's running at and do it all from those two terminals in the diag block. I doubt your problem is fuel pump related though. Fuel related perhaps, but not pump related.

I'm not surprised you received the wrong relay...the quoted price seems cheap. Btw did the original problem disappear during the week you drove with the jumper?

 

[Chris R]

Your best guesses pretty much suck

Haha, not surprising.

Pumping the pedal when cranking does absolutely nothing in a fuel injected car. Holding it to the floor is another story but we won't get into that.

Understood.

Fuel pump gets it's power through the EFI fuse both during normal operation and when using FP to run it. If the EFI fuse was blown you'd have a lot more issues. Nor would you hear the pump.

I thought that fuse would have something to do with it, simply because it was the only one that had anything to do with fuel. But it checked out, and there have been no other, newer, issues.

What happened to you getting a fuel pressure gage? Be handy right about now. There are several ways to check the pump. 1) Look at the screw on top of the pulsation damper. 2) Crack the CSI line. 3) Set your meter to current and use it in place of the jumper.

I think now that I'm schooling in Wichita, I'll be able to rent one. Our local mechanic bailed on us, and never got back to our repeated calls. We gave up.

But I can do the meter tomorrow.

Too bad you don't have a scope. With it could tell everything about the pump's health including what rpm it's running at and do it all from those two terminals in the diag block. I doubt your problem is fuel pump related though. Fuel related perhaps, but not pump related.

I'm not surprised you received the wrong relay...the quoted price seems cheap. Btw did the original problem disappear during the week you drove with the jumper?

The original problem half-disappeared. The loabing idle was still there, especially after the car warms up. But aside from that, the bad misfiring, sputter, low end torque loss, lack of throttle response and so on went away as soon as I jumpered that connection. Even the ACIS system smoothed out quite a bit. No huge jump at 3500-3800. I think the misfire returned today, but at the lower rpms.

What price should I be looking for? It's a Cressida 7MGE motor, JDM. And I'm not sure which of the parts in the engine bay he left alone and which ones he replaced. I've tried to contact him to get some idea, but I guess I already used up my one question when I asked him about the throttle body and something else. And nope, heh, it was no where near as bad as I am with you guys. But eh, I guessing since I've bought the car it is now my sole responsibility to reverse-engineer his stupid mistakes. And that's on top of the ones I make!