89 Gt difficult starting (cold)
#1
Burning Brakes
Thread Starter
89 Gt difficult starting (cold)
Hi Chaps, I am having issues starting my 89GT. To recap I had a idle issue AND a starting issue back in 2018 when I first bought the car. The starting issue turned out to be a broken king lead/coil connection. New leads all good, car then started great, first time, every time. Since 2018 the car has started well and idled well after about 2 mins of running so I have lived with it until now although I have bought a NOS ICV but not fitted yet.
However in the last couple of weeks I have been having terrible starting issues. When the key is turned it will fire but not catch and further starting achieves nothing other than flooding it. If I pull the FP relay XX and crank it, it will start and run, but then go very rich and run lumpy when I replace the relay. Once its running and "cleared" itself, it runs very well right up to WOT. I will be swapping the ICV but I don't think that's implicated in the starting problem, just idling. Where do I start in the troubleshooting - MAF, LH/EZK?
David
89Gt
86S2
88 944 Turbo S
However in the last couple of weeks I have been having terrible starting issues. When the key is turned it will fire but not catch and further starting achieves nothing other than flooding it. If I pull the FP relay XX and crank it, it will start and run, but then go very rich and run lumpy when I replace the relay. Once its running and "cleared" itself, it runs very well right up to WOT. I will be swapping the ICV but I don't think that's implicated in the starting problem, just idling. Where do I start in the troubleshooting - MAF, LH/EZK?
David
89Gt
86S2
88 944 Turbo S
Last edited by C531XHO; 07-20-2023 at 05:34 AM.
#2
Have you rebuilt the LH and MAF yet?
Also pull your vacuum lines off the FPR and dampers, if you smell or see fuel they have failed.
Is your tach bouncing when cranking. If not you could have a failed CPS.
Also pull your vacuum lines off the FPR and dampers, if you smell or see fuel they have failed.
Is your tach bouncing when cranking. If not you could have a failed CPS.
Last edited by Adamant1971; 07-18-2023 at 03:36 PM.
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Mrmerlin (07-18-2023)
#3
Rennlist Member
Mine did the exact same thing. I would pull fuse 42(fuel pump,O2 sensor). Engine would then start and I just pushed fuse back in. Only happened when cold. My problem was a failing MAF.
#4
Hi Chaps, I am having issues starting my 89GT. To recap I had a idle issue AND a starting issue back in 2018 when I first bought the car. The starting issue turned out to be a broken king lead/coil connection. New leads all good, car then started great, first time, every time. Since 2018 the car has started well and idled well after about 2 mins of running so I have lived with it until now although I have bought a NOS ICV but not fitted yet.
However in the last couple of weeks I have been having terrible starting issues. When the key is turned it will fire but not catch and further starting achieves nothing other than flooding it. If I pull the FP relay XX and crank it, it will start and run, but then go very rich and run lumpy when I replace the relay. Once its running and "cleared" itself, it runs very well right up to WOT. I will be swapping the ICV but I don't think that's implicated in the starting problem, just idling. Where do I start in the troubleshooting - MAF, LH/EZK?
David
89Gt
86S2
88 944 Turbo S
However in the last couple of weeks I have been having terrible starting issues. When the key is turned it will fire but not catch and further starting achieves nothing other than flooding it. If I pull the FP relay XX and crank it, it will start and run, but then go very rich and run lumpy when I replace the relay. Once its running and "cleared" itself, it runs very well right up to WOT. I will be swapping the ICV but I don't think that's implicated in the starting problem, just idling. Where do I start in the troubleshooting - MAF, LH/EZK?
David
89Gt
86S2
88 944 Turbo S
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#5
Temp II sensor? Mine behaved similarly (first start was fine, but if I shut off before it was warmed up it would need to sit for while and belched black when I got it started again).
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Adamant1971 (07-18-2023)
#6
Burning Brakes
Thread Starter
I checked the dampers and FPR, there is a slight smell but I can pull a vacuum on all of them and they hold
Re tach bounce, yes I think so as it does run
Last edited by C531XHO; 07-19-2023 at 02:44 PM.
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#8
Burning Brakes
Thread Starter
#9
Burning Brakes
Thread Starter
EDIT - measured the following at the LH & EZK;
- LH ground pin #17 to Temp II pin #13 = 2.397 kohms
- EZK ground pin #18 to Temp II pin #19 = 2.44 kohms
- both at approx 20degC ambient, against a spec of 1.4 to 3.6 kohms so in spec at that single temperature in both measurement cases and with ~1.8% variation side to side
For the present I am ruling out an issue with Temp II
Last edited by C531XHO; 07-19-2023 at 03:56 PM.
#10
#11
Team Owner
send out the MAF and the LH computer for rebuild ,
keep an eye on the dampers and FPR.
While the parts are out go charge the battery
keep an eye on the dampers and FPR.
While the parts are out go charge the battery
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Adamant1971 (07-19-2023)
#12
Rennlist Member
It is not clear to me whether you are talking about cold starting or hot starting.
The temp2 values are fine for cold starting - I assume that is when you are having issues.
The temp2 values are fine for cold starting - I assume that is when you are having issues.
#13
Burning Brakes
Thread Starter
Hi Fred, yes cold start is the issue. Battery fully charged. I have been over the various grounds and cleaned them last year, but I think I will add these to the check list including the engine earth strap
#14
Rennlist Member
Mike is excellent to deal with and doubtless he will turn your kit around test wise in no time should you elect to send the MAF and LH unit off to him and if the LH is original it might be worthwhile getting him to revamp it pre-emptively as it is not a question of if rather a question of when it goes **** up.
Considering the dialogue to date I cannot think of anything else that is obvious other than things like wiring harness issues
#15
Team Owner
Please post a picture of the engine bay and the mileage, and if an intake refresh is ever been completed