patrick205gti Posted October 1, 2005 Report Share Posted October 1, 2005 Hi there, We have a 1991 J reg, 120,000 mile 1984cc Bosch fuel injected VW Passat that has the following problem. When driving the car either on light throttle or no throttle the car jerks and generally does not run very well. It does not do it on acceleration, half/ full throttle etc. It has been to our local specialist but they have not been able to diagnose the problem. Hope that you can help. Cheers, Patrick Link to comment Share on other sites More sharing options...
mcnalu Posted October 1, 2005 Report Share Posted October 1, 2005 Hi Patrick Is it a Bosch K mechanical injection? If so I may be able to provide some advice. Andrew Link to comment Share on other sites More sharing options...
patrick205gti Posted October 5, 2005 Author Report Share Posted October 5, 2005 Hi Andrew, Been away and only just got your reply, thanks though. Just found out that it does have Bosch K mechanical injection. It is still at the garage awaiting an air flow meter to see if that helps. Cheers, Patrick Link to comment Share on other sites More sharing options...
mcnalu Posted October 5, 2005 Report Share Posted October 5, 2005 Patrick I recently rebuilt the Bosch K on my old mercedes. I had to do this because I couldn't find a mechanic who understood the Bosch K. A young mechanic even asked "where's all the wires?"! Is there a difference in the idle between when the car is cold (first few minutes) and when it is warm? The reason I ask is that the Bosch K has devices for enriching the mixture and upping the idle revs when cold. They could be faulty. Here's what to check - make sure your mechanic doesn't jump over the first two - the cheapest and easiest fixes are first: 1. Check the idle mixture and speed - WITH THE ENGINE WARM - if it's been setup when cold then the mixture will be weak and the idle will be too low when warm. 2. If you think someone may have fiddled with it - check the air flow meter's plate is centered and positioned correctly in height. 3. Look for air leaks. Listen for hissing noises and hunt for cracked hoses and gaskets. If air is getting in after the air flow meter then not enough fuel will be added and so a weak mixture will cause bad idling. 4. Replace o rings on the fuel injectors 5. Test or replace the fuel injectors (it can be as expensive to buy one as test it) 6. Check/replace the aux air valve, warm up regulator, cold start valve, fuel distributor (new ones can be pricey, if still available) Link to comment Share on other sites More sharing options...
Wobby Posted October 6, 2005 Report Share Posted October 6, 2005 Nice advice mcnalu Hang on, whats that i can hear? Sounds like an alarm of some kind!! Sorry Link to comment Share on other sites More sharing options...
mulkbear Posted October 6, 2005 Report Share Posted October 6, 2005 Now i am no go with older stuff but try sparying brake cleaner around the induction pipe when the engine is running does the engine cut out or engine speed change if is does you have a leak in you indution system ! Hope this is some help ! Link to comment Share on other sites More sharing options...
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