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Help, Zetec Engine Problem ???
Posted 10 April 2003 - 05:54 AM
I have been having problems with my engine for almost a year now and have taken it to garages, and ford on multiple occasions and no one can work out what the hell is wrong with it (although ford claim that it is 'fixed' every time I go to pick it up).
When you are driving (normally, warm engine) it feels like it has a huge hollow in the power band between 4500 and 5000 rpm. It is also incredibly gutless when it is cold and often starts jerking violently when at a lower rpm (2500 - 3000 rpm). My dad’s theory is that the hole in my power band happens at a lower rpm while the engine is still cold.
My dad and I took it out on an open road last night to see exactly what its doing around what revs etc. By watching the needles, I would say it would end up being graphed something like this.
So far a garage has replaced my oil filter and described the problem as "it feels like something is choking it”, they checked out my whole exhaust and could find anything blocking it. Ford has replaced my spark plugs and leads (two separate occasions) and another guy I know who works in a garage recons it’s my fuel injector sensors (or something like that).
If anyone has heard of a similar problem or think they know what could be wrong plz let me because I can't afford to keep having it looked at with no prevail.
Deryn | email@example.com
Posted 10 April 2003 - 01:54 PM
Have Ford checked to see if your car is chucking up any fault codes?
Posted 10 April 2003 - 02:36 PM
It could literally be dozens of things ranging from a knackered air filter to a broken-up catalytic converter. Is this the original cat, or has it been replaced?
Red '99 Daytona 955i |
Posted 10 April 2003 - 03:17 PM
between 2000 and 3500rpm but its only in the last 2 months its started doing it
im going to change the fuel filter this weekend as it has not been done since ive had the car (45000miles )
to see if that helps ill let you know if it does
Co-owner and builder of the mk1 V8
In the garage at the mo
Jaguar S-Type R 4.2 V8 Supercharged (02)(being scrapped)
MEV Exocet kit car (having fun in it )
Chevrolet camaro Z28 (83)(Gone to the big scrap yard in the sky)
Pontiac Trans-am (84) Ford Mondeo ST220(03)(Now gone but not forgotten)
Back in a FORD Mondeo ST
Posted 11 April 2003 - 05:21 AM
There is one thing tho! I remember a couple of occaisions when i used to work in a garage (apprentice = pants pay) of a few people coming in with there cars it was somthing to do with the valves and compresion problems at higher end revs? although somthings saying to me it was the earlier Zetec's that had that prob?? maybe somone else will be able to help with that one!
Good luck m8 < there's always drink!
Posted 11 April 2003 - 07:56 PM
I reset the ECU today and it did drive better than usual, although by the afternoon it felt like the problem was slowly creeping back. I will take a look at the air filter and fuel filter (provided I can find it ) tomorrow. I assume I should be checking to see if the filters are dirty/clogged, is there anything else I should look out for while in the area?
TB: I don't know if ford have checked for fault codes or not but knowing those dodgy basteds probably not. I might try a different ford garage next time I take it in.
Rich: I am fairly sure that it is the original cat.
Chris: Yeah, drink does make the problem less noticeable.
Posted 11 April 2003 - 11:36 PM
What you've tried/results of this-
Posted 13 April 2003 - 02:56 AM
• 96 Contour Zetec Auto
• 77 Ramcharger 440 Auto
Posted 14 April 2003 - 03:41 AM
When you got the exhaust cam advanced was this because you had performance cams fitted?
If so i would get the Ignition timing checked, also the fitting of performance cams can cause flat spots.(not normally to the extent to which you describe)
If not i would get the Ignition Timing checked anyway, also get the compression checked playing with standard cams aint recommended, 1 tooth is alot in cam terms and can cause low compression and timing probs.
When the flat spot occurs does it missfire or sound like uv got 1 mother of a Cone filter on it and are away to suck the kids of the street with it! HEHE!!
or if ya kinda stamp on the throttle when not moving does it hesitate to rev and sound like a mother of a cone filter and then burst into life?
if so it sounds alot like valve/ignition timing is out get the ignition timing checked.
Advancing of the exhaust cam means the valves opens earlier (doh!), so if they open earlier they could be opening to soon after ignition of the fuel which means the pistons aren't getting enough of a push from the ignition of the fuel, and therfore causing a flat spot where the peak power starts to come in, similar to performance cams exept there designed to do this so the power can be deliver higher in the RPM range where you can possibly find more BHP/Torque (varies from car to car, V6,24v,16v & 8v etc)
When i had an older car i retarded the ignition timing (can only be done Pre Lambda sensor) so when ya dropped a gear to slow down it backfired and spat flames out ma straight pipe!! Was ace!! for that but performance suffered!
Hope ya get the drift of what i am saying if not let me know and i will try and make it a bit easier to understand!
Hope this helps
Posted 14 April 2003 - 03:43 AM