Volvo RWD 700 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 8/2018 700 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

Sporadic loss of power - suspect fuel issue 700 1990

Howdy folks.

So about a week ago, I tore apart my dash to get to the heater core. As I removed the fuse/relay tray, I saw a jumper wire running from my fuel pump circuit to the sunroof, which I'm sure doesn't belong there. I think it was a hack-ish fix to a failed hybrid fuel-pump circuit on an old ECU. I removed it, and the car ran great for about a week.


Finally actually swapped cores last night and flushed (ran it around the block with tap water in it), then filled with Zerex G-05 and distilled water.

Now, I'm getting weird power losses at steady cruising speeds - any engine speed, it will start to bog down and moving the gas pedal does nothing unless I push it far enough to kick down a gear. If I am accelerating, it doesn't do it. If I'm cruising it does it the most, and sometimes if I am decelerating.
I got a Check Engine Light (CEL) and it threw two codes: 2-3-2 and 1-3-3.
I've never seen a 1-3-3 code before. The FAQ says that's 232 is too rich/lean at idle and the 1-3-3 says faulty TPS. I did get a high idle when I parked just after the CEL came on.


I pulled the AMM to try to get it to limp-home mode, and of course the idle jumped to 1300 when I did. Then I tried to drive off and it died. Restarted and died again. AMM reconnected it runs.
So I thought it must be a vacuum leak. In the process of doing the heater core last night, I moved this vacuum line that runs from the manifold on a 1/2" line to a check valve and then to a tiny vinyl line that runs through the firewall and supplies the vacuum reservoir mounted under the dash.
I checked around by spraying starting fluid at every vacuum fitting and air intake junction, and nothing made a difference. I don't think this fits the symptoms for the ignition amplifier overheating (plus it's 70F here, and I replaced the thermal paste 3 years ago. I do have a spare.).

What I think it might be:
-The jumper wire was critical to feed power to the fuel pump (with it attached, it runs constantly in KP2) because my non-pink label ECU somehow failed. The ECU is from 92. Don't recall the code off it right now, but it's easy enough to check.

-I caused a massive vacuum leak that I can't find somehow or damaged the check-valve.

-I messed up a wire to something like the Engine Coolant Temp Sensor that feeds the ECU somehow in the process of doing things.

-My brick is possessed by demons angry that I removed the original heater core

-The TPS is misadjusted so badly that it's playing with the IAC valve while I'm cruising with a part-open throttle. I think the easy fix for this is to simply disconnect the TPS (assuming it idles at all then). I cleaned the throttle body (TB) about 5-8K miles ago and replaced the TB gasket. I also adjusted the TPS when I did this. Maybe I left the adjusting screws slightly loose and they're managed to work their way completely loose so the TPS can flop around.

-The Radio Suppression Relay (RSR) has very haggard wiring from my engine swap 3.5 years ago. I pulled a pigtail and relay from the local wrecker on my way home. When I held my hand on the RSR and revved the engine, I could feel it sort of clicking, but not a solid click, more of a vibration or clicking on and off.


Can anybody help me narrow this down? I think that right now, I'll go replace the harness for the RSR after reinforcing this new-to-me used relay's solder. Then I will see if it runs with the TPS disconnected (or IAC). Then I will reconnect that jumper wire from fuse 11 to fuse 10 that I swear should not be there.

Cheers






THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New Sporadic loss of power - suspect fuel issue [700][1990]
posted by  Will740turbo subscriber  on Wed May 14 16:46 CST 2014 >


<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.