| Author | Message | ||
| Russ Turner (Snj5)
Member Username: Snj5 Post Number: 601 Registered: 2-2003 |
My Mondial developed a seeping leak from an old fuel hose where it went into the tank. If you remove the right rear wheel that will give you access to the STANDARD Bosch K-jet accumulator and fuel filter, as well as all of the lines into the tank. Pretty straightforward from there checking everything.. | ||
| Verell Boaen (Verell)
Intermediate Member Username: Verell Post Number: 1240 Registered: 5-2001 |
I don't have much Mondial experience, so I'm not quite sure what getting to the fuel accumulator involves. From the FPC it looks like it's either behind or beside the RH fuel tank. The accumulator is #48. Remove line #16 from the nipple on the back of the accumulator. If any fuel drains out of the line, then the accumulator is broken.  If you replace the accumulator, then you might as well replace the fuel filter (#75). The accumulator is about $120 if it's the same one my QV uses(& sure looks similar on the dwg). The filter is very common & costs about $15-$25. | ||
| mario ottaway (Mario308)
New member Username: Mario308 Post Number: 16 Registered: 5-2001 |
Hi Verell, I do remember a strong smell of fuel once or twice around the exhausts when this problem occurs, as you probably know we don't have cats, emission control or any other "junk" fitted to this age of car in the UK (so I don't think the unburnt fuel would do any harm - and I've got a sports exhaust fitted for many years now. I haven't done the accumulator check yet is it simply a matter of jacking up the car and removing the right hand rear wheel or do you need to remove the weather shield after the wheel to get access? I would be surprised if the injectors were faulty as this fault comes and goes its not a constant fault yet but thanks for the help so far I am building up a good case of theories before attempting a fix. | ||
| dave handa (Davehanda)
Intermediate Member Username: Davehanda Post Number: 2043 Registered: 5-2001 |
One mechanic said you can roughly test for a bad check vavle or fuel accumulator by cranking for a few seconds, stopping, then cranking, then stopping then cranking,...if it catches on the third or fourth try, it is building up the lost pressure....at least that is what he said to me.... | ||
| Verell Boaen (Verell)
Intermediate Member Username: Verell Post Number: 1233 Registered: 5-2001 |
mario, Have someone stand behind the car while you're cranking it for a hot restart. If they can smell a distinct fuel odor from the exhaust, then there's a good chance you've got leaky injectors. Another test would be to crank it briefly, then pull the spark plugs. If the injectors are leaking some of them will be wet with fuel. Based on your need to hold the throttle open, leaky injectors that are flooding the engine are the most likely diagnosis. Also, have you made the fuel accumulator check I mentioned in my earlier post? | ||
| Ron D. Robinson (Awsmondial)
New member Username: Awsmondial Post Number: 1 Registered: 8-2003 |
Had the same problem with my '88 mondial cab and diagnosed the problem to be a faulty therm timing switch which is located under the intake plum. Apparently, this is some kind of coolant sensor that tells the cold start injector when to shut down (i.e. when the engine is warm and the additional fuel is no longer needed). I diagnosed the problem by first disconnecting the cold start injector wire (with the engine warm). The car started and ran as normal. Then I reconnected the cold start injector wire and removed the safety wire from the fuel distributor. Car would not start. Next I reconnected the fuel distributor wire and diconnected the thermo timing switch wire (It's under the intake plum near the oil filter. I't a bit of a pain to get the wire connector off with the filter installed but was able to do so after several minutes of trying)and started the car. Car started and ran as normal. Thermo timing switch was replaced (it cost about $120 from McCann's) and all is right with the world again. | ||
| hiran Fernando (Hbferdy)
New member Username: Hbferdy Post Number: 5 Registered: 10-2003 |
Yes I had this problem in my 328, and by disconnecting the blue safety switch connection and running the fuel pump directly from the ign solved the problem, which gave a lead on trouble shooting. I then adjusted my warm control pressure and CO adjustment and it runs fine now.SO I suggust you first disconnect the blue connector and see if it solves the problem. Good luck! | ||
| mario ottaway (Mario308)
New member Username: Mario308 Post Number: 15 Registered: 5-2001 |
Hi Bruce, Verell & Dave, My 1983 Mondial QV does this sometimes when hot. I'd be grateful if you could post the results of what you find out it may help me diagnose my hot start problems. I can usually get it to fire if I floor the gas pedal after leaving it say 15-20 mins, and lots of cranking, never a problem from cold or immediate starts from hot??? Has anyone ever tried to pull the blue connector off the fuel distributor to make the fuel pump run with just the ignition on rather than in the start position? I've been told this may re pressurize the fuel system to avoid vapour lock. In the 10 years I've had my car this has only happened in the last 12-18m so must get it fixed. | ||
| dave handa (Davehanda)
Intermediate Member Username: Davehanda Post Number: 2023 Registered: 5-2001 |
Usually one of three things (according to my research), the check valve in the fuel pump (which you replaced, so probably not that), the fuel accumulator as mentioned by Verell, or leaky fuel injectors. Mine will usually start if I hold the gas pedal down partially while cranking hot.... BTW, I am taking my car in at the end of the month to get this properly diagnosed...but I also ordered new Bosch fuel injectors and intend to replace them all with the new upgraded brass ones. | ||
| Verell Boaen (Verell)
Intermediate Member Username: Verell Post Number: 1230 Registered: 5-2001 |
Unfortunately, there are a lot of things in a K-Jetronic system that can cause hot start problems. Search the 'Technical Q&A Archives', for 'hot start' or similar phrases. there are quite a few threads with tips on diagnosing hot start problems. One of the more common causes is a leaky fuel accumulator that lets pressure bleed off, resulting in a vapor-lock somewhere in the system. When things cool down, the vapor lock disipates & gas can flow again. A quick check of the accumulator is to pull the small 'vacuum line' type hose off of the back of the accumulator. If any gas drips or pours out, you've most likely found your problem. | ||
| bruce wexler (Brucewexler)
New member Username: Brucewexler Post Number: 1 Registered: 10-2003 |
My 1983 Mondial Quadrovalve starts fine when it's cold, but after driving it won't restart.I have just changed the fuel filter and fuel pump (replacing old one with new Bosch which seems to work well). Seem to have plenty of spark too. |