Hard to Start. But after 3 very strong cranks, it's fine.
10-02-2014, 07:42 AM
#1
2nd Gear
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Hard to Start. But after 3 very strong cranks, it's fine.
First time ,long time on this sight. I have a 91, L98 beautiful bright Red coupe. Starting her has gotten hard. It takes about 3 very strong cranks before it turns over. I've replaced the fuel filter, did a fuel pressure test and replaced the old worn battery. Injectors were also replaced about 15000 miles ago,or about 5 years.This issue just started after the long winter under the cover. I also put textron in the last fuel fill. Still running on it. Any ideas would be greatly appreciated.
10-02-2014, 09:12 AM
#2
"My Dad's a TV Repairman"
With the items you've replaced, I'd lean towards the coolant temperature sensor. If it's artificially sending elevated temperature readings to the ECM, the start fuel-enrichment can be less than needed for a quick crank. I've dealt with this several times, both C4 and C5.
I'm assuming that the throttle body is clean, your air filter is serviceable and your opti/plugs/wires are good. If that's the case, one other thing I'd (very remotely, BTW) think of would be the oil pressure sensor- If it doesn't send high enough reading on crank, the injectors won't fire, according to a master tech I talked to. So no personal experience on that one, but again, possible.
I'm assuming that the throttle body is clean, your air filter is serviceable and your opti/plugs/wires are good. If that's the case, one other thing I'd (very remotely, BTW) think of would be the oil pressure sensor- If it doesn't send high enough reading on crank, the injectors won't fire, according to a master tech I talked to. So no personal experience on that one, but again, possible.