tayson Posted Monday at 01:39 PM Share Posted Monday at 01:39 PM Hi im having a problem i can't figure out. I did a engine swap on a 96 rd688s and the elm says v mac 2. The engine is put in was out of a early 96 and ecm says just v mac. The timing is high most of the time. Really loud clatter. At cruising speeds about every 30 seconds it will advance the timing by itself and I have to put in neutral for 3 seconds on idle and it will then go back to running smooth again. It sounds and runs best under boost. Tps is not fluctuating. What would not be compatible between the 2 e7 motors or do I have a advance problem? Ecm shows no codes Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/ Share on other sites More sharing options...
fjh Posted Monday at 02:20 PM Share Posted Monday at 02:20 PM Do you have a code reader ? Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583878 Share on other sites More sharing options...
fjh Posted Monday at 02:23 PM Share Posted Monday at 02:23 PM Try unplugging the tem on the side of the pump! If the timing still fluctuates it’s likely the ecovance at fault! If the spring in the econovance is broken the timing can float All over the place! Please explain what you hear/ see at start up! Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583879 Share on other sites More sharing options...
tayson Posted Monday at 03:38 PM Author Share Posted Monday at 03:38 PM 1 hour ago, fjh said: Do you have a code reader ? We put 2 different computers on it and they didn't show any codes Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583887 Share on other sites More sharing options...
tayson Posted Monday at 03:41 PM Author Share Posted Monday at 03:41 PM 1 hour ago, fjh said: Try unplugging the tem on the side of the pump! If the timing still fluctuates it’s likely the ecovance at fault! If the spring in the econovance is broken the timing can float All over the place! Please explain what you hear/ see at start up! Ok when I start it will rev a little and then go to 650 on the tac. A light puff of blue smoke at very first and the clears. I have changed the econovance with another used one and both do the same thing. I haven't tried what you said so I will definitely try that Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583889 Share on other sites More sharing options...
fjh Posted Monday at 03:43 PM Share Posted Monday at 03:43 PM 3 minutes ago, tayson said: We put 2 different computers on it and they didn't show any codes When you first start the engine ! Does it stumble and smoke ? Then clean up? Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583890 Share on other sites More sharing options...
fjh Posted Monday at 03:47 PM Share Posted Monday at 03:47 PM 4 minutes ago, tayson said: Ok when I start it will rev a little and then go to 650 on the tac. A light puff of blue smoke at very first and the clears. I have changed the econovance with another used one and both do the same thing. I haven't tried what you said so I will definitely try that Disregard that Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583891 Share on other sites More sharing options...
fjh Posted Monday at 03:57 PM Share Posted Monday at 03:57 PM Do you know how to check timing? If the timing is going up to a point where you have clatter you may have a couple of issues! Even at max timing it shouldn’t clatter! (Ping) don’t keep running it like that! If you have another econovance solenoid swap it! Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583893 Share on other sites More sharing options...
tayson Posted Monday at 06:03 PM Author Share Posted Monday at 06:03 PM 2 hours ago, fjh said: When you first start the engine ! Does it stumble and smoke ? Then clean up? If it stumbles it's not very much Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583896 Share on other sites More sharing options...
tayson Posted Monday at 06:05 PM Author Share Posted Monday at 06:05 PM 2 hours ago, fjh said: Do you know how to check timing? If the timing is going up to a point where you have clatter you may have a couple of issues! Even at max timing it shouldn’t clatter! (Ping) don’t keep running it like that! If you have another econovance solenoid swap it! Ok I did swap the econovance and it had no change and I haven't learned how to check the timing yet Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583897 Share on other sites More sharing options...
fjh Posted Monday at 06:07 PM Share Posted Monday at 06:07 PM 1 minute ago, tayson said: Ok I did swap the econovance and it had no change and I haven't learned how to check the timing yet Solenoid? Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583898 Share on other sites More sharing options...
fjh Posted Monday at 06:20 PM Share Posted Monday at 06:20 PM So I will try and explain how to check the timing to get it close! You need proper tool to set perfect! How ever this will get it close! On the bottom of the engine housing there will be a small cover 2 bolts or six bolts 10 mil have you seen this cover? You need to remove the cover and the timing event marker!turn the engine to the degree’s markings on the flywheel set it too the initial (timing mark ) usually found on one of the valve covers 6 -10 degrees go to the tem hole and look inside of every thing is as it should be you will see what looks like a flat blade screw driver ! If it is not there or is not centered the tone ring has slipped! This means you will need to pull the fuel pump and have the ring re installed to its correct position! Note you may have to turn the engine 180 to make sure your on number 1. just sayin I have run into this! Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583900 Share on other sites More sharing options...
tayson Posted yesterday at 02:51 PM Author Share Posted yesterday at 02:51 PM 20 hours ago, fjh said: So I will try and explain how to check the timing to get it close! You need proper tool to set perfect! How ever this will get it close! On the bottom of the engine housing there will be a small cover 2 bolts or six bolts 10 mil have you seen this cover? You need to remove the cover and the timing event marker!turn the engine to the degree’s markings on the flywheel set it too the initial (timing mark ) usually found on one of the valve covers 6 -10 degrees go to the tem hole and look inside of every thing is as it should be you will see what looks like a flat blade screw driver ! If it is not there or is not centered the tone ring has slipped! This means you will need to pull the fuel pump and have the ring re installed to its correct position! Note you may have to turn the engine 180 to make sure your on number 1. just sayin I have run into this! Ok thank you I'll try it Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583951 Share on other sites More sharing options...
fjh Posted 23 hours ago Share Posted 23 hours ago 8 hours ago, tayson said: Ok thank you I'll try it If you get stuck on something pm me or post! Quote Link to comment https://www.bigmacktrucks.com/topic/76019-tayson/#findComment-583974 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.