Customer at a loss.....
Customer at a loss.....
I have a customer who has a ZZ4 TPI engine running a stock MAF ECU.
Here's his problem.
He runs the car 5 minutes, then it runs like crap 1500 RPM or less. The check engine light goes on.The idle will wander, and it sputters a bit under 1500. If he shuts the engine down, and starts up again, he's good for another 5 minutes until the problem starts again. Runs great for 5 min, then goes to ****.
He gets a MAF code (33).
I have not personally TOUCHED the car. He has a shop working on it.
The shop, is trouble guessing. They replaced:
1. IAC
2. MAF
3. Burnoff relay
4. Put in a heated O2
5. TPS
6. Injectors
7. Tuned it up.
Anyone ever see anything like this? I'm at a loss, and don't want him to buy more unnecessary parts. Better to trouble shoot rather than keep guessing.
Here's his problem.
He runs the car 5 minutes, then it runs like crap 1500 RPM or less. The check engine light goes on.The idle will wander, and it sputters a bit under 1500. If he shuts the engine down, and starts up again, he's good for another 5 minutes until the problem starts again. Runs great for 5 min, then goes to ****.
He gets a MAF code (33).
I have not personally TOUCHED the car. He has a shop working on it.
The shop, is trouble guessing. They replaced:
1. IAC
2. MAF
3. Burnoff relay
4. Put in a heated O2
5. TPS
6. Injectors
7. Tuned it up.
Anyone ever see anything like this? I'm at a loss, and don't want him to buy more unnecessary parts. Better to trouble shoot rather than keep guessing.
Supreme Member
iTrader: (7)
Joined: Jul 2000
Posts: 2,047
Likes: 2
From: Prince George, BC, Canada
Car: 89 GTA
Engine: 5.7L Supercharged
Transmission: T-56
Axle/Gears: Moser 9" 3.70
Re: Customer at a loss.....
Anyone hooked up a scantool to it? Might be able to see something going on in the data stream.
Senior Member
Joined: Dec 2009
Posts: 850
Likes: 8
From: Chilliwack BC
Car: White 1987 IROC-Z
Engine: 305 TPI LB9, 215 HP
Transmission: Borg-Warner T5 NWC
Axle/Gears: Borg-Warner 7.75 with 3.27 ratio
Re: Customer at a loss.....
I have a customer who has a ZZ4 TPI engine running a stock MAF ECU.
Here's his problem.
He runs the car 5 minutes, then it runs like crap 1500 RPM or less. The check engine light goes on.The idle will wander, and it sputters a bit under 1500. If he shuts the engine down, and starts up again, he's good for another 5 minutes until the problem starts again. Runs great for 5 min, then goes to ****.
He gets a MAF code (33).
I have not personally TOUCHED the car. He has a shop working on it.
The shop, is trouble guessing. They replaced:
1. IAC
2. MAF
3. Burnoff relay
4. Put in a heated O2
5. TPS
6. Injectors
7. Tuned it up.
Anyone ever see anything like this? I'm at a loss, and don't want him to buy more unnecessary parts. Better to trouble shoot rather than keep guessing.
Here's his problem.
He runs the car 5 minutes, then it runs like crap 1500 RPM or less. The check engine light goes on.The idle will wander, and it sputters a bit under 1500. If he shuts the engine down, and starts up again, he's good for another 5 minutes until the problem starts again. Runs great for 5 min, then goes to ****.
He gets a MAF code (33).
I have not personally TOUCHED the car. He has a shop working on it.
The shop, is trouble guessing. They replaced:
1. IAC
2. MAF
3. Burnoff relay
4. Put in a heated O2
5. TPS
6. Injectors
7. Tuned it up.
Anyone ever see anything like this? I'm at a loss, and don't want him to buy more unnecessary parts. Better to trouble shoot rather than keep guessing.
Does it do the same thing if the MAF is disconnected??
Check circuit 998 dark green wire going to the MAF from the ECU, this is the MAF signal circuit.
It should go into the "limp home mode" with the MAF disconnected!!
Possibly the ECU is pooched, based on all the replaced parts so far!!!
Re: Customer at a loss.....
Hello InjectorsPlus!!
Does it do the same thing if the MAF is disconnected??
Check circuit 998 dark green wire going to the MAF from the ECU, this is the MAF signal circuit.
It should go into the "limp home mode" with the MAF disconnected!!
Possibly the ECU is pooched, based on all the replaced parts so far!!!
Does it do the same thing if the MAF is disconnected??
Check circuit 998 dark green wire going to the MAF from the ECU, this is the MAF signal circuit.
It should go into the "limp home mode" with the MAF disconnected!!
Possibly the ECU is pooched, based on all the replaced parts so far!!!
I'll pass this forward.
I'm at a disadvantage as I never saw the car or mechanic. I met the customer, but not the car.
Re: Customer at a loss.....
I think the mechanic is over his head. I'm going to have him take it to my home shop here. I know my guy will figure it out.
Then I have to drive him home (doing him a favor) and he's an hour away. So I'm trying to avoid that.
Then I have to drive him home (doing him a favor) and he's an hour away. So I'm trying to avoid that.
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