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EL 4.0L Problem 

 

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 Post subject: EL 4.0L Problem
Posted: Sat Jun 16, 2007 1:47 pm 
Tyre Shredder
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Had a squizzy thru the forums and couldnt find a answer to my problem so here goes.
Have noticed over the past few days that when driving the engine seems to hesitate a few times then run ok. Also on start up, sometimes the motor jerks violently, also have noticed on the driveway alot of black soot from I assume the exhaust, anyone got any ideas ?. I did replace leads and plugs last year.

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Posted: Sat Jun 16, 2007 2:25 pm 
Tyre Shredder
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im sort of having the same prob and iv replaced coil pak leads ect and stil having the prob but i got no soot out of my zorst thow i think its just a elimernation proces by changing things 1 at a time witch is a bugger

 

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Posted: Sat Jun 16, 2007 10:42 pm 
Parts Gopher
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Might be an idea to check the computer for error codes. It might be able to tell you what's wrong if it's just a crappy sensor. I'd be looking at the coil too (just check the resistance values with a multi-meter).

 

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Posted: Sun Jun 17, 2007 1:57 am 
Smokin em up
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I had a similar problem with my first XR6, took it to Bayfords 3 times, left it overnite also, blowin soot like crazy at times, an other times would run ok, $900 later and changin a few parts in the ignition, still the same, was given a phn number to some GMH apprentice, told him the problem, he said, change the sender unit on the exhaust pipe, cost of $90 and it did the trick... Bayfords... well... what can I say.....

 

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Posted: Sun Jun 17, 2007 5:58 am 
Getting Side Ways
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Wow you have the same problem i did!!! but mine was only on cold mornings over the past week and a half. Mine ended up being a faulty IAT sensor (Intake air temp sensor) or also known as "HEGO" sensor but may have been caused by incorrect ignition timing (approx 8 deg retarded) which was fixed just today.So after replacing the oxygen sensor, IAT sensor it fixed the problem with engine hesitating on cold starts from stand still. Now these 2 parts from Repco shouldnt cost you much more than $100 (IAT sensor $36 and oxy sensor $67) Now the oxy sensor did improve fuel economy straight up but the IAT sensor fixed the hesitaion on cold starts.

(Below from a repair manual covering falcon I6 1994-1998)
Now if youre symptoms are: poor idle, stalling and poor driveabilty. This could be caused buy an inoperative purge control soleniod, a damaged canister, split or cracked hoses or hoses connected to the wrong tubes.

As so many have poor idling, stalling problems in the older E series this may be the problem as i dont recall it being mentioned before (but if i searched it pobarbly has been!!)

P.S DONT go to Fraud for the IAT sensor as they wanted $150 list price and $136 discounted...
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Posted: Sun Jun 17, 2007 4:18 pm 
Tyre Shredder
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Just hooked up a timimg light and it would seem the timing is way out..What would of caused the timing to go out of whack ? Do I have to put the ECU in diagnostic mode to do the timing?

When I do the timing do I just line up the marks and tighten the distributor, or should the mark on the harmonic balancer be just before the other fixed mark..

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Posted: Sun Jun 17, 2007 4:25 pm 
Getting Side Ways
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joolz wrote:
Wow you have the same problem i did!!! but mine was only on cold mornings over the past week and a half. Mine ended up being a faulty IAT sensor (Intake air temp sensor) or also known as "HEGO" sensor but may have been caused by incorrect ignition timing (approx 8 deg retarded) which was fixed just today.


The IAT and HEGO are not the same theyre 2 separate sensors

IAT = intake air temp
HEGO = heated exhaust gas oxygen (O2 ssensor for short)

which did u get replaced?

 

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Posted: Sun Jun 17, 2007 4:26 pm 
Getting Side Ways
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clean your fuel injectors dude.

 

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Posted: Sun Jun 17, 2007 4:28 pm 
Getting Side Ways
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yeah it looks like it was a mixture problem with yours as both the IAT and O2 would have affected mixture....did you get them changed at the same time?

 

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Posted: Sun Jun 17, 2007 4:40 pm 
Tyre Shredder
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Hey guys this is getting off topic, can we get back to my problem please.
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Posted: Sun Jun 17, 2007 4:51 pm 
Getting Side Ways
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eh duh, maybe YOUR problem is the same as his problem....

 

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Posted: Mon Jun 18, 2007 2:38 pm 
Getting Side Ways
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I replaced both the IAT and oxy sensor, the new IAT sensor fixed the problem with the car hesitating when cold and the oxy did improve fuel economy in hwy driving. But after all that i still had a slightly rough idle. I later found out that the ignition timing was out heaps (7-8 deg retarded) Its been like this since i bought the car. I found out how to perform the timing adjust correctly thanks to arm79. The procedure changed after ED. On EF & EL in self test mode the engine will rise in revs then fall, after that approx 2min the engine will almost stall then idle again, after this is when the timing is set (0 deg +/- 2 deg) The idle is perfect now with no hesitation and alot more power.
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