efi Volvo LH 2.2 EFI Conversion questions

[MAD02]

Good morning. 

 

I just recently completed my EFI conversion to a Bosch LH 2.2 system from a mid 80's Volvo 240. I followed 02Coastie's awesome post and it was an easy conversion. Here's 02Coasties original post.....

 

My 2002 runs and drives great, but its running lean under load. My AEM wideband O2 sensor is reading low 15's to low 16's under heavy load, which is bad. Under partial and light load its in the high 14's. During idle the reading is in the high 13's.  Here is what my 2002 is running.

 

Stock, worn engine.

Vacuum advance dizzy

Bosch LH 2.2 Jetronic 544 ECU and wire harness, TPS, MAF sensor from a 1986 Volvo 240 

Stock Volvo 2.3L fuel injectors

New coolant temp sensor

Bosch fuel pump from a Volvo 240 Turbo

Fuel Pressure Regulator from a E30 325i

 

I am not running an Oxygen Sensor, because I'm running the wideband, so I'm assuming this might be the issue. If there's anyone out there that knows these Bosch systems better than I do I'd love for you to chime in on what may be causing this. Other than this issue, the car is running very well. 

 

Thanks, and a safe Holiday weekend to all. 

 

P.S.  I tried posting this on the TurboBricks forum, but my account wouldn't let me post for some reason...

Edited July 3, 2016 by MAD02

[Mike87]

Most WB o2 sensors also have provisions for standard o2 output. Hook it up and see what happens.

[02Coastie]

3 hours ago, Mike87 said:

Most WB o2 sensors also have provisions for standard o2 output. Hook it up and see what happens.

 

This! I used the analog output on my innovate wb02. 

 

 

For injectors I used later 4hole style Bosch injectors out of a neon 16v. I believe they are 19lbs-ish. Maybe the Volvo injectors are tired or need cleaning? Also I believe some year LH's used low impedance injectors and required resistors.

 

Finally, have you adjusted the MAF? Search on TB for the led & resistor tool you can make to dial it in. This had a significant impact on my overall afr's if I recall correctly.

 

Edited July 3, 2016 by 02Coastie

[MAD02]

Thanks for the responses guys.

 

I still have the AEM instructions somewhere so I'll hook it up to the existing Volvo O2 sensor.

 

02 coastie, I'm using the Volvo fuel injectors because I tried some Ford 17 and 19 pound units and neither fired when connected to the Bosch ecu. I'm not sure if they're high or low impendence injectors. I'll pick up some of those neon injectors next time I'm at the junkyard. 

 

Thanks!

 

 

[jimk]

55 minutes ago, MAD02 said:

I'm not sure if they're high or low impendence injectors

Use an Ohm meter.

[Henning]

I came to this idea a few years ago, too. At that time I used to have a rusty parts car. Too bad condition to save it, but nearly complete. Standard engine and dizzy, LH 2.2 with Volvo harness, MAF, temp sensor, fuel regulator and injectors. The fuel pump is tii. Since I don't like the buddha intake of the E30 that much, I went tii/320i. Here are some pics:

 

 

I wrapped a copper wire around the Volvo temp sensor to fit into the 02 divider. Fuel rail in the center and top right the idle valve.

 

 

Air regulation valve (how do you call it?) below the intake. It's a temporarily fixing- I didn't know if the experiment would work.

Fuel pressure valve:

 

 

No better positioning possible, I'm not happy with this.

Offside branch to idle and air valve:

 

 

The TPS is located below the throttle housing because on top it looks like a cockroach. For this I had to change the rotation of the throttle:

 

 

And the air flow meter inside the airbox:

 

 

The main airbox is custom, the normal one is too small. But the covers are some bigger than they have to be, there's some clearance I took advantage of.

 

The engine started immediately and the car was accelerating great- as far as I could check it out with its stuck brakes, torn tires and half of the exhaust missing. Unfortunately, the idle wasn't good, the engine was shivering heavily. Maybe the fuel pressure is too high of the injectors need cleaning. Should I check out some BMW injectors? But since they are all old and stored for years now...

 

hen

 

[02Coastie]

1 hour ago, Henning said:

Unfortunately, the idle wasn't good, the engine was shivering heavily. Maybe the fuel pressure is too high of the injectors need cleaning. Should I check out some BMW injectors? But since they are all old and stored for years now...

 

hen

 

 

I too had idle issues initially. I ended up permanently jumping the A/C input wire on the harness. This raised the idle to around 900 and smoothed everything out.

[jimk]

Why not buy this for $150 instead of trying to work with something that is not configurable (or at least nobody bothers to reprogram). 

[02Coastie]

3 minutes ago, jimk said:

Why not buy this for $150 instead of trying to work with something that is not configurable (or at least nobody bothers to reprogram). 

 

Buy what?

[Henning]

50 minutes ago, 02Coastie said:

 

Buy what?

 

Yes, buy what?

 

Coastie: what do you mean by 'permanently jumping the AC input'? Permanent power?

 

hen

 

[jimk]

1 hour ago, 02Coastie said:

 

Buy what?

Ooops forgot the link.  Try again.

http://www.ebay.com/itm/262507655283?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I cut my EFI teeth on one of these.