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Car Forum / Volvo Cars / April 20071989 740GL throttle body
Difficulty starting, especially in the cold. Replaced plugs, wires, cap and rotor, but still have issues. When car does start, it will run rough for the first 4 or 5 minutes, then will run fine. Tried starting this AM, car sputtered for a couple seconds and died . I pulled the plugs, and they were wet (gas). They also had a carbon build up on them. I cleaned the plugs and tried again. Car almost started, but it didn't quite catch. Researching the group, sounds like the throttle body needs a cleaning along with the flame trap. Should I look at anything else while I'm in there? Thanks in advance, pretty sure I wouldn't have 199k miles without this group! John > Difficulty starting, especially in the cold. Replaced plugs, wires, > cap and rotor, but still have issues. When car does start, it will [quoted text clipped - 10 lines] > > John Yes - under the throttle body is the small cylindrical Idle Air Control Valve. That also gets its share of glop. Between the throttle body and the IACV you can expect to go through a pint or so of carburetor cleaner spray... no kidding! The throttle body is best cleaned by removing it so you can "shoot" through it, but it can be cleaned on the car. Pay special attention to the small passage on the lower part of the TB that connects each side of the throttle area to the knurled idle adjustment screw at the bottom. I prefer to count the number of turns and 1/4 turns the screw is open, then remove the screw for cleaning the passages. Squirt lots of cleaner through there, then reinstall the screw as far open as it was. BTW, the idle speed is actually set by the ECU, so the screw merely adjusts the range of the IACV operation. Be careful with the hoses on the IACV. If they have hardened they can be brittle. Mike On Apr 5, 6:26 pm, "Michael Pardee" <michaeltn...@cybertrails.com> wrote: > > Difficulty starting, especially in the cold. Replaced plugs, wires, > > cap and rotor, but still have issues. When car does start, it will [quoted text clipped - 31 lines] > > - Show quoted text - Thanks Michael. I'm betting the hoses will need to be replaced. Is the retro-fit for the flame trap the way to go? > On Apr 5, 6:26 pm, "Michael Pardee" <michaeltn...@cybertrails.com> > wrote: [quoted text clipped - 44 lines] > Thanks Michael. I'm betting the hoses will need to be replaced. Is > the retro-fit for the flame trap the way to go? The flame trap can be cleaned, but most people prefer to replace or remove the screen altogether. Mike > Thanks Michael. I'm betting the hoses will need to be replaced. Is > the retro-fit for the flame trap the way to go? I think it's worth it, the kit was only ~$25 last time I bought one and it makes servicing the all-important flame trap so much easier. I have no idea why Volvo chose to hide such a critical but otherwise simple to deal with part so well. > > Thanks Michael. I'm betting the hoses will need to be replaced. Is > > the retro-fit for the flame trap the way to go? [quoted text clipped - 3 lines] > no idea why Volvo chose to hide such a critical but otherwise simple to > deal with part so well. Thanks James, have a nice Easter. You too Mike- > > > Thanks Michael. I'm betting the hoses will need to be replaced. Is > > > the retro-fit for the flame trap the way to go? [quoted text clipped - 5 lines] > > Thanks James, have a nice Easter. You too Mike- Well, I spent the beter part of Saturday cleaning the throttle body and IACV. Also replaced the flame trap. On the first try, the car ran rough for 5 seconds, peaking at 1000 RPM, and died. Tried to restart, but it wouldn't catch. Pulled the plugs, they were gassy. Dried and replaced. Car did the same thing. I'll continue to research the newsgroup to see what else I should look at. Thanks again for your help- John 1989 740GL 199,902 miles >>>>Thanks Michael. I'm betting the hoses will need to be replaced. Is >>>>the retro-fit for the flame trap the way to go? [quoted text clipped - 17 lines] > 1989 740GL > 199,902 miles How's the wiring harness? '89 may be updated or it may have the crumbling engine wiring. > >>>>Thanks Michael. I'm betting the hoses will need to be replaced. Is > >>>>the retro-fit for the flame trap the way to go? [quoted text clipped - 22 lines] > > - Show quoted text - I was hoping the wiring harness wasn't the issue, guess that's the next step. And so close to 200,000 miles...Only scrap yard with a Volvo in my area does the pulling for you. $150 still a good price? Thanks again for the reply. >>>>>>Thanks Michael. I'm betting the hoses will need to be replaced. Is >>>>>>the retro-fit for the flame trap the way to go? [quoted text clipped - 27 lines] > Volvo in my area does the pulling for you. $150 still a good price? > Thanks again for the reply. I dunno, the harness is only $15 around here, but you have to pull it yourself. Might check and see what Dave Barton has, he sells good harnesses but they're in the $150-$250 range IIRC. You'll want to check your harness first though, the one you have might be fine, '89 is the transition year. Since you have no other suspect, run a test to rule out a failing fuel pressure regulator. http://brickboard.com/FAQ/700-900/FuelSystem.htm#Fuel_Pressure_Regulator > Since you have no other suspect, run a test to rule out a failing fuel > pressure regulator. > > http://brickboard.com/FAQ/700-900/FuelSystem.htm#Fuel_Pressure_Regulator So after all the cleaning and non starts, I went out of town for a couple weeks. When I got home this weekend, guess what started right up. Idles very high, ~2300, but I found a couple other posts in the group explaining the fix after cleaning the throttle body,trap,etc. I can't thank you guys enough for all the help!! Now on to the 200k medallion. Thanks again-
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