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SVTPerformance's Chain of Restaurants
Road Side Pub
Need help with my sons car
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<blockquote data-quote="kevinatfms" data-source="post: 16333285" data-attributes="member: 39344"><p>A couple things to check:</p><p></p><p>1. EGR vacuum port. Use a vacuum pump and pump the EGR up and see if it stumbles at idle. If it stumbles you have good flow. If it doesnt the port could be clogged. This also depends on if its a plastic or aluminum intake(they changed sometime in the 99/00 era). The plastic ones usually dont clog as carbon build up isnt bad on plastic. If its the aluminum intake they were terrible at gumming up. If it has the original aluminum DPFE sensor it needs to be replaced also. They were notorious for causing stumbles and there was a TSB to replace them on 99% of Ford cars that came in with stumbles. Some set CELs while others would torment owners/techs.</p><p></p><p>2. Intake gaskets. I know you said you replaced them but alot of times guys pinch them when putting the intake back on. Id double check using carb cleaner and see if the STFT changes when you spray around the intake base.</p><p></p><p>3. The plastic intake. I had a plastic intake one time split at the back. Didnt make any sucking noise or anything but enough of a leak to cause a lean condition. Carb cleaner by a co worker found that one.</p><p></p><p>4. Pull the ignition coil off and look for "white lightning". Small cracks can develop on the coil which will arc to the bracket. Usually on the sides or under the lip of the coil itself. </p><p></p><p>5. Compression test cylinders 4/5/6. I had a run of Taurus and Escapes with the 3.0L DOHC engine that seemed to like to burn exhaust valves on those cylinders. Replaced at least 50 or so in a two year period. If the compression test comes up good, plug an air hose to the cylinder and rotate the crank. You should hear air whoosh out of the intake and exhaust but stop when you have closed each valve. If you get to the exhaust side and it doesnt fully seat then you know burned exhaust valve.</p><p>It was also always the "front" cylinder head for some reason. I dont think i ever replaced a rear cylinder head ever.</p></blockquote><p></p>
[QUOTE="kevinatfms, post: 16333285, member: 39344"] A couple things to check: 1. EGR vacuum port. Use a vacuum pump and pump the EGR up and see if it stumbles at idle. If it stumbles you have good flow. If it doesnt the port could be clogged. This also depends on if its a plastic or aluminum intake(they changed sometime in the 99/00 era). The plastic ones usually dont clog as carbon build up isnt bad on plastic. If its the aluminum intake they were terrible at gumming up. If it has the original aluminum DPFE sensor it needs to be replaced also. They were notorious for causing stumbles and there was a TSB to replace them on 99% of Ford cars that came in with stumbles. Some set CELs while others would torment owners/techs. 2. Intake gaskets. I know you said you replaced them but alot of times guys pinch them when putting the intake back on. Id double check using carb cleaner and see if the STFT changes when you spray around the intake base. 3. The plastic intake. I had a plastic intake one time split at the back. Didnt make any sucking noise or anything but enough of a leak to cause a lean condition. Carb cleaner by a co worker found that one. 4. Pull the ignition coil off and look for "white lightning". Small cracks can develop on the coil which will arc to the bracket. Usually on the sides or under the lip of the coil itself. 5. Compression test cylinders 4/5/6. I had a run of Taurus and Escapes with the 3.0L DOHC engine that seemed to like to burn exhaust valves on those cylinders. Replaced at least 50 or so in a two year period. If the compression test comes up good, plug an air hose to the cylinder and rotate the crank. You should hear air whoosh out of the intake and exhaust but stop when you have closed each valve. If you get to the exhaust side and it doesnt fully seat then you know burned exhaust valve. It was also always the "front" cylinder head for some reason. I dont think i ever replaced a rear cylinder head ever. [/QUOTE]
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Need help with my sons car
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